Reselling used LEGO sets from auctions: verify completeness before you call it complete
A full-looking box is not a complete set. A built model in a lot photo can be missing the one minifigure that carried most of its value, a sticker sheet can be half used, and a handful of small parts can be gone without changing how the pile looks from above. LEGO resale guides for collectors start from a set already in hand. An auction flipper starts earlier, with a catalogue photo and a decision about what the verification work will cost. That work is the business here: identify the set, check it against its own inventory, and only then give it a price.
A note on money: this is general information about reselling, not financial advice. No set is guaranteed to sell, or to sell at any particular price.
The runbook, in order
Run the same sequence on every set, before any listing work. The order matters: each step decides whether the next one is worth the time.
- Name the set by number, not by theme. The set number is printed on the box and in the instructions, and it is the key to everything else — the inventory, the instructions, and the sold listings for that exact set. A pile described only by theme is not yet a set; it is bulk until a number can be proved from the parts and figures present.
- Pull the inventory for that set. Since 2008, LEGO instruction booklets have included a parts inventory, with an image of each part above a part number that encodes mould and colour, and the inventory can be searched on BrickLink. If the booklet is gone, LEGO's Building Instructions section holds thousands of complete guides that download free as PDFs — a missing booklet is a fact to state in a listing, not a block on verifying the set.
- Separate the minifigures first. Pull the figures out and store them apart from the bricks. Part-out guidance gives the same instruction for a practical reason: the figures sell first. Collector guidance adds the risk: minifigures are often the most valuable part of a set and the most faked or swapped part of it, so each figure gets checked against the set inventory, accessories included. A lot photo with no figure photos at all is a red flag — work on the assumption that figures are missing or swapped until they are shown.
- Count against the inventory, in categories. Printed and special parts first, then figures, then the ordinary bricks. Note every missing element by its element ID, which is given in the list at the back of the building instructions. That ID, with the set number, is what a replacement request or a parts purchase needs.
- Grade the stickers where they sit. Look at the applied stickers on the model itself: lifting corners, bubbles, crooked placement. Then record the verdict on the box before the set goes on a shelf: complete, complete with named defects, or incomplete with the missing elements listed.
Success, at the end of the runbook, looks like a written record — set number, inventory checked, figures verified, stickers graded, missing elements named. A set with that record can be priced. A set without it can only be guessed at.
Grade bricks, figures and stickers separately
One grade for the whole set hides the part a buyer will complain about. Grade three things separately, because they fail in different ways and only some of the failures can be repaired.
| Part of the set | What to check | Can it be fixed? |
|---|---|---|
| Bricks and printed parts | Discoloration, scratches, cracks and playwear, photographed close and stated in the listing | Missing elements can be sourced by element ID and set number; damaged or discoloured parts are a grade deduction, not a repair |
| Minifigures | Each figure and accessory against the set inventory; swapped or counterfeit figures | A missing figure can sometimes be bought on its own — cost it before deciding, because the figure may carry most of the set's value |
| Stickers | Peeling, bubbling or crooked applied stickers; whether an unused sheet survives | Usually not. Applied stickers are hard to reposition without damage, and replacement sheets cannot be ordered from LEGO for most retired sets |
| Instructions and box | Booklet present and readable; box present and its condition | The booklet is replaceable as a free PDF download from LEGO; the paper original and the box are not — their absence is priced, not repaired |
That last distinction is where auction lots are most often mispriced. A missing booklet sounds serious and costs nothing to work around. A missing sticker sheet sounds minor and, on a retired set, may be impossible to replace at any sensible cost. Price the second one; do not price the first one twice.
Complete, repair, part out, or bulk: the route decision
The record from the runbook points at one of four routes.
Sell it as a complete set when the inventory checks out and the figures verify. Completeness is what this buyer is paying for: a complete set, with its manual, is easier to identify and price than a random assortment.
Complete it first when the missing list is short and named. Cost each element, add the time, and compare that total with the difference between the incomplete and complete sold evidence. A set that is 95% complete is not worth 95% of a complete example — sometimes the last few parts close a much larger gap, and sometimes they close almost none. The sold listings, not the percentage, say which.
Part it out when the set will not verify as complete but its figures and printed parts are sound. Figures come out first and are listed first; the rest follows as parts lots, with condition — playwear, yellowing, scratches on prints — stated plainly.
Sell it as bulk when no set number can be proved. Bulk is an honest product when it is described as bulk. It becomes a problem only when a listing borrows a set name the contents have not earned.
Two standing rules from the buying runs behind this site apply on every route. Check the item before the buyer gets there — a completeness surprise found at the bench costs a lower, honest price, while the same surprise found by a buyer costs a return. And the item must match what the listing says: if a part is missing, a sticker is peeling, or a brick is discoloured, that fact belongs in the listing or in the photos, before the sale.
The honest math, and the kill criterion
Price from sold evidence for the exact set number, matched on condition and completeness, with outliers removed — never from asking prices, and never from a retail figure printed on an auction page. Then subtract the whole cost stack: the all-in auction cost, any replacement elements, packaging and channel costs, and the counting and sorting time, which on a large set is the biggest line in the stack. Selling costs and time reduce the net on every route; a part-out multiplies the listings, so it multiplies the time as well.
Keep the records as the money comes in. Canadian peer-to-peer sellers report that income as self-employment income, and registration for GST/HST generally becomes required once taxable supplies pass $30,000 over four calendar quarters. A per-set record — cost, replacements, route, net — is the same record that makes the next buying decision better, and part-out guidance gives the same advice: track the net per set.
The kill criterion: if the verified parts of a lot — the figures and special parts that can be named and priced from sold evidence — do not cover the all-in cost plus the replacement and time cost of completing it, do not buy it as a set. Buy it as bulk at a bulk price, or pass. Counting someone else's mixed bin at set prices is how a cheap lot turns into a weekend of unpaid sorting.
General information only, not financial or tax advice. Instructions, replacement and tax details cited were checked on November 1, 2026 against LEGO's help pages and the Canada Revenue Agency's peer-to-peer guidance; check the current pages for the exact set and your own situation. Resale results vary and no profit is promised or guaranteed.
— Sterling Cole, Money Writer — Earning Desk