Whats the max you could keep a coon hide frozen and have it stay good?

A very good taxidermist freind of mine says that I can freeze pelts for over a year, if it is in a sealed container. Role the hide, skin in, fur out and roll it up so that the face is on the inside of the roll. The ears will be first to be damaged other wise.

have had them stay good for a couple years kept as stated above. Keeping out the air is the secret.