My next door/over the hedge neighbour's house is empty. It has been for the 18 months I've lived in my home. He comes over every now and again and potters but I don't actually know what he's doing.
Anyway, sometimes when he's been, he leaves his black bin out for collection (collected fortnightly) and then the black bin is left out on the pavement until next time he comes. This Is usually weeks.
Every now and then when our black bin is full, I'll chuck the odd bag in his bin when it has been left on the pavement. I know it's CFery but wouldn't you?