Well around here, They end up in the bottom of one of the tool boxes,among the dirt and bits and pieces. Or in the storage organizer behind the seat in the truck,(always the first place I look for one) they also seem to have an affinity to locate and roll up anything sitting on the floor that has a slight lift in the edge contacting the floor and hide there.
I use to save the tubes and put them in a small parts drawer, they do seem to have a life and will of their own.
