Nothing was looked up. This list came out of the code you just scanned — no app, no account, no signal. It is not saved anywhere until you tap Save below.
Pack a box
Your box list never leaves this browser. Numbers, rooms and everything you list inside are saved on this device only — no account, no server, no ads, and nothing is uploaded when you print. The one thing that travels is the QR label: the contents are written inside the code, so whoever scans a box can read them. That is why they stay off the printed label unless you ask for them.
Leave the number blank and the next one is used. The limits, up front: 500 boxes in a list, 100 things in a box, 60 characters a thing — and you will be told the moment one of them bites.
Boxes
Pack, seal, label, repeat. Future-you at the new house will be grateful.
Off by default on purpose: movers are unanimous that a box reading passport · jewellery · cash is an invitation. The QR carries the contents either way.
Tape a label on each box — scanning it with any phone camera shows what's inside, even at the new place with no internet set up.