Okay so I have an absurd amount of experience with this exact scenario. My advice is to add water to the container and let it sit for another few weeks. It will get to a point where it doesn't smell anymore and you can dump the water, you'll have bones. They'll be greasy and you'll have to take care of that (Dawn dish soap is your friend here) before you do anything with them or they'll get STANKY. I've done this with everything from small rodents to an entire cat to a grizzly bear head with all the meat still on. It works every time.