LEGO Missing Pieces Checklist: What to Record Before You File
Before you open the replacement form, write down four things for every missing item: the set number, the element ID, the quantity, and the bag or build step where you noticed it. Use the downloadable checklist below, then submit a separate request for each set.
This turns a vague “I’m missing a small grey piece” problem into a request someone can actually verify. It also gives you a record if a part is unavailable and you need to buy it later.
Download the checklist
Download the LEGO missing pieces checklist (CSV). It opens in Excel, Google Sheets, or any plain-text editor. Make one copy per set.
| Field | What to enter | Where to find it |
|---|---|---|
| Set number | The set’s number, such as 10303 | Box front or instruction booklet |
| Element ID | The colour-specific number for the piece | Parts inventory at the back of the booklet |
| Quantity | How many are missing from this set | Count the build step and your sorted parts |
| Bag or step | Bag number and instruction page/step | The step where the piece should have been used |
| Description | Short plain-English description | Useful for printed pieces, stickers, or pieces without a visible number |
| Checked | Yes/no after a second search | Use before submitting the request |
Find the right number
The number printed in a parts inventory is an element ID, not just a shape number. Colour matters: two identical moulds in different colours can have different element IDs. Copy the full number, including leading zeroes if the booklet shows them.
If the part is a sticker sheet, cape, printed element, or another item without a clear inventory number, keep the description and the instruction step in the CSV. That gives the form’s description field enough context to identify it.
Use one checklist per set
LEGO’s replacement service says that requests covering more than one set must be submitted separately. Do not combine set 10303 and set 71799 in one sheet or one form. Duplicate the blank CSV, rename each copy with its set number, and submit them one at a time.
Do a ten-minute second search
- Recheck the open bags, the box folds, and the instruction booklet.
- Compare the build step with the parts inventory, not with memory.
- Look for a piece already attached in the wrong earlier step.
- Mark the row “yes” only after the second search still finds nothing.
What this file does and does not prove
The checklist is a preparation tool. It does not promise that every requested piece is in stock or that every request will be approved. Keep the original set information and your completed copy until the replacement arrives.
Page checked 26 September 2026. The downloadable file is a BrickMend template, not an official LEGO form.