Happened to me recently when moving. Couldn't find one of my zigbee temperature sensors, but it was still reporting information diligently, so it had to be somewhere in the house. Took about 6 months before I found it.
Anticlimactic, partly unpacked moving box. I was mostly surprised it was able to re-join the mesh while being in a completely different spot, something that a lot zigbee chips struggle with.
I’m reminded of the time I dropped a Juul behind/beside a makeshift workshop table and it magnetically attached itself a foot or so below to the freestanding metal shelving unit directly next to it.
I don’t advise using Juul products for this and other reasons.
