After two days of turning the place upside-down, I have found my keys!
They were in the cardboard box with the tools* in the cupboard.
Where’s the strangest place you’ve found a lost thing?
My other record was the tiny top-box key my friend lost in a flooded field campsite we’d been forced to abandon in Wales. I found it in the long grass two days [and much searching by the loser of the keys] later, by approximating the location of the car and then tents, the walking backwards and forwards through the grass until success.
Can you beat that?
*Pulverising devices, according to some