"Random Mosaic – Detecting unauthorized physical access with beans, lentils and colored rice"
https://dys2p.com/en/2021-12-tamper-evident-protection.html#random-mosaic-rm
1) put device in bag 2) put bagged device in another bag 3) pour in a mixture of different colored beans, forming a visual mosaic 4) send picture of mosaic to recipient
EDIT: author is on fedi @dys2p