That’s a good one, Calendargirl!
It wasn’t really a weird one, just a needle in a haystack thing, but a little dd once took some very small toys she was obsessed with, on holiday.
Almost inevitably, a favourite went missing - she was distraught. We had a room right on the beach and kind staff did really make an effort to find it - raking the sand, etc. but no luck.
Returned the following year, to exactly the same room. One night there was a bit of a storm, rain and wind, and in the morning, unbelievably, there was her little toy, lying on top of the sand.
I told her it was a very specially lucky toy, so she’d better take very good care of it in future.
Of course Sod’s law meant she lost it again not long afterwards - and this time we never found it.