I had a whitetail mounted last year that had been in the freezer since 2005. Turned out perfect. I also took NTT a coyote hide that had been in the freezer since 1999-ish (I forgot about it), and again, it turned out perfect. It was pretty stiff, and I thought it would be ruined. After talking to the guy at NTT, as long as bacterial rot doesn't set in, they can usually reclaim a freezer burned hide. Reason being is that tanning is a chemical process that works on the collagen in the hide, and it is not dependent on the moisture in the hide.
And yes, most taxidermists just send hides to North Texas Tannery, then charge you a very inflated price. Cut out the middleman and send it to them yourself.
[This message has been edited by Log (edited 5/14/2013 10:37p).]