I cached some of my 'stuff' in the hub cap one day, years ago when I passing through Texas. Can't be to careful you know. When I got across state I popped off the hubcap to retrieve it. Much to my dismay the contents had broken open and the 'stuff' went flying when I popped the hub cap off!
I was a good 2 or 3 hours recovering it, one small piece at a time,,, with tweezers. Dang, should have used some tin foil, shiny side out.