Find My is great. I hid an AirTag in my bike, which got promptly stolen (as bikes tend to be in London): I had near-zero hope but police _actually_ was keen to retrieve it, it evolved into a multi-week adventure where they tried to retrieve it several times but the thief just rode away. Ended up finding it in a shady bike shop, with a fresh new coat of bright silver paint.

I was skeptical when I bought the airtag, I thought I'd just lose a bike _and_ an airtag, but now I can't recommend it enough!