Wondrous item, rare
Once per day, as an action, you can open the étui and name aloud a nonmagical tool or instrument that would fit inside it — no longer than 7 inches, no heavier than 2 pounds. If neither you nor any creature within 5 feet of you is carrying that tool, it is in the case. It is plain work of this city, it is real, and it stays. A tool drawn out this way serves as artisan's tools or a tool kit of its kind for any check that calls for one.
The case supplies what is missing, and it makes what is missing. On the dawn after a tool is drawn out, one nonmagical instrument that you own is gone from your possession. It is not dropped, mislaid, or stolen in any manner you can trace, and no divination shows the taking.
Instruments lost in this way have afterwards been found in the pledge-houses of this city, wiped, ticketed and priced, with a folio number written on the ticket that answers to no ledger any pledge-house keeps.
Source: Provenance — The Quist Sale