Do raisins have a maximum shelf life? I have a box of raisins in my cabinet that have been there for many years. Should I discard them or can they still be salvaged for use in baking or cooking?
According to this Sun Maid specification sheet, the shelf life is up to one year, and they contain about 15% water. 

This is probably not sufficiently dehydrated for truly long term storage, and mold would be a risk.  Also, if they did dry further in storage they would be rock hard, and probably quite nasty.