2.9 y.o. DS is busy working on a 'posting' schema and I am starting to get seriously cross with him posting stuff into stupid places. He's lost a piece of his favourite jigsaw through the landing floorboards, leaves the freezer door open trying to get things into the gap between fridge & freezer and is constantly in danger of damaging the dishwasher & washing machine by posting thin items into unsuitable gaps.
I need some alternative activities to give him to do instead as efforts to stop him aren't working. Any ideas? His preference is for posting small thin things e.g. laminated labels into thin gaps.