Forget the freezing and the microwave. Find a product to kill bugs that contains paradichlorobenzene as the active ingredient. If you can't find something like that you might try washing everything in a flea shampoo that is used for pets and then repackage in new bags. Washing with borax in the water will also work and you can put dry borax in the bag with the material. Messy but no bugs.

Most products that are used in a closet or chest to protect clothing from moths will work.

You might also contact a natural history museum and see what they use to protect their animal and bird specimens.

Good luck getting rid of the critters.

Jerry