You should be able to see if the meat is freezer burnt when you open up the package and before you cook it.
Typically, venison that is freezer burnt will be a different color (often a light tan) from the purple-red of the venison and will have a dried out look (which it is). It will be most often seen where the wrapped meat is thin (along an edge) or on the surface. It can be removed and the rest of the meat should be fine.
It is air trapped in along with the wrapped venison that causes the freezer burn. WELL-WRAPPED red meat stored in a deep freeze at a temperature below zero (I do -15) will keep well for at least 2-3 years, probably longer (opinions may vary) with no sign of freezer burn and still retain good flavor.
I hope this helps.
Take Care,
Tom