it was a round "tub" shaped can and not soup can shape with no tab

opener.sold as cooked ground beef and from a company in my area,which is why i bought it.just out of the bag on on the shelf where it stayed.

from the label it was sold for camping and hunters as it had a outdoor type label with a deer on it.i have not seen in the store latey.
thinking about it maybe the wood shelf attracted damp and that
started the problem.i'll put shelf paper down.