Nobody dared eat it even though the seal was intact, so they fed it to one of the museum cats, who promptly chowed down and suffered no ill effects.
Shelf life on canned food is for flavor viability, not "safe to eat" purposes.
I buy a few cans of soup or stew every time I grocery shop (I don’t normally eat them), and I have what I estimate to be several months worth in an emergency situation. I believe that cans kept in a climate controlled area (my house) will last pretty much forever. Does anybody disagree with this?