Ted,
Where Dennis & I live there ain't a problem w/ mud or slides. In fact I don't know of a collector in SoCal that does have that problem.

Reproduction/Fantasy Cans
http://i124.photobucket.com/albums/p2/oldegaspump/AllCansMASTERTHUMBNAIL_zps4bfdbbc7.jpg
Rnd Can Re-lids