Almost none of it is what you bought
A pencil case emptied at the end of term holds fourteen things, and an inventory against the receipt shows almost none of it started in that case.

One pencil case, emptied, drawn actual size. Fourteen things laid out in a loose row beneath it: four pencils, no two the same length or brand, a pen with no lid, a lid with no pen, a rubber worn to a wedge, a broken ruler, three loose crayons, a small plastic animal, a folded sticker, a key.
Fourteen weeks passed with nobody watching, and this is the closing balance.
What does a pen with no lid, next to a lid with no pen, actually prove?
That things moved between children rather than simply vanishing.
A lost lid is a small mystery on its own. A lidless pen sitting beside an orphaned lid that plainly belongs to something else is a record of circulation: pens and lids parting from their original owners and recombining at random, passed hand to hand across a term until the pairing that comes home bears no relation to what went out in September.
What can't be explained about the key?
Nothing — it has no obvious job in a pencil case at all, and no story arrives with it.
A pencil, a rubber, a crayon all have an evident reason for being there. A key has none. It came from somewhere, was picked up or handed over for some reason now unrecoverable, and stayed. It is the one item on the list that resists every explanation the other thirteen supply on their own.
Why are only one pencil and the ruler still in good condition?
Because neither was ever worth taking.
The ruler snapped early — probably on the first week — and a broken ruler has no value to anyone looking to swap, so it kept its finish exactly as it was the day it broke, chip aside. One pencil, plausibly an unfavoured colour or an unfamiliar brand, went untouched for the same reason: nothing about either object made it worth borrowing, so neither one wore down the way everything traded or fought over clearly did.
Why lay everything out at actual size in a row rather than just describing it?
Because a row is a document; a description is somebody's summary of one.
Listed in words, "a broken ruler and some crayons" reads as clutter. Laid out at true scale, item by item, it becomes an inventory that can be checked against a receipt from September — a side-by-side comparison the reader can make for themselves rather than one the parent has already made for them.
How is this different from a case covered in doodles on the outside?
That design is the surface an older child covers over years of their own schooling, drawn from memory by the adult who made it; this one is a parent's count of what a current child's case holds inside, taken without that child present to explain any of it.
Nothing here is drawn on. It is a list, and lists don't accumulate meaning the way a doodled surface does — they just get checked.
Is this the same kind of audit as what turns up in a pocket?
Close, but a pocket is emptied once, on one day, by one act of turning it out — nine objects found in a single pocket is a snapshot, where a term's worth of pencil case contents is closer to a ledger with fourteen weeks behind it.
A pocket collects whatever was picked up that day and stops. A pencil case keeps a running account across a whole term, trading items in and out the entire time, so what comes out at the end is a result rather than a single moment.
Does the same kind of accounting apply to things that don't come back at all?
Yes — thirty hair elastics sent out and three returned is the same arithmetic run to its harder conclusion: a pencil case loses items to trade and gets some back; the elastics simply leave and mostly never do.
Both are running costs a parent tracks without ever writing the number down anywhere. The pencil case at least shows its workings — you can see what replaced what. The elastics don't offer that.
Does it print well?
Yes — fourteen small flat objects in a row read clearly as long as each keeps a distinct silhouette.
Auction-lot photography works well here: even, flat light, no dramatic shadow competing between items, each object kept small enough to read as a shape rather than a rendering. Two or three inks across the whole row is enough — the case itself in one solid colour, the contents in muted tones that don't fight the mustard ground behind them.
How do I get one made?
Describe the case at JustOG — what's actually still in it, right down to the things that don't belong. Pick a direction, drag the crop frame, see it composited on the real garment, and it's made to order and shipped.
Designs other people have published are in the shop.
Nobody remembers whose key that is. It goes back in for next term regardless.