I usually gather all of my b/w film for processing at home in a box, and just do it all once a year. I also have some misc. c-41 rolls that are at least 5 years old, I don't know what it is on them so I've never bothered to pay the money to find out.
As for the find, you never know you might find something really interesting in there. Vivian Mairer's negatives were found in a storage shed sale.