If it stays under 45 degrees, you can hang them for a couple of weeks. I did that with my last deer and man that was good! This sounds sick, but its a good sign when mold starts to grow on the carcass... you just get a rag, put vinegar on it, wipe it down and it'll come right off. The mold doesn't hurt anything! You just don't want to have the temperature go from above freezing to below freezing, I don't know what it is, but its bad for the meat.

I would not put it in the fridge unless you have to! We did that with some antelope and it smelled so bad, it about made me barf! the meat was still good though.

I don't know much about the packaging part.