I have brought back my moose and caribou meat processed on one occasion. I had filled the tags early and the outfitter was going into town. He took it to the processor with my instructions. After the hunt I picked it up, threw it into the freezer and turned the generator on. It sure was convenient. The agent at the border never looked in the freezer. As far as I know there is no problem with processed meat. Have your receipt from the processor.
Last year I brought the meat back unprocessed in a freezer with the temp set at 35 degrees.

The Canada - Non Resident Firearm Declarations cost $25 Canadian.

Best of luck to you. Enjoy your hunt.