I have the canning thread in the cooking section on canning. I have been canning meat for ten years now. I have learned one thing about canning meat; if in doubt throw it out.
That being said, if you check the seal push on the lid if it pops when you push in the center of the lid the seal has been broken. If not it passes the first test. Next pore the contents into a pan and cook down all juices back into the meat at a simmer. Once all juice is cooked back into the meat, as its cooking pay attention to the odor, If it smells good that passing the second test. When you taste the meat if it has any sign of spoilage don’t continue throw it away. If it tastes fine it is most likely good to go. Without having the meat tested in a lab there is no test you can perform that guarantee your canned venison is good. Not at home or from a store.
Any product you buy could be bad, if you bought something from a store and had doubt you would take it back or throw it away.
So after that long winded answer to your question, if the seal is good the meat is good. This process preserves the meat as long as the seal is good. I’ve had venison packed away from 2011 and opened the jar just last year, it was great. Five years is not uncommon. I do not can every year just when I want more canned venison or when my mother begs me for some more or my sister, brother or friends.
I hope this is helpful and you have the confidence to open the canned venison and enjoy.
Bruce