a few tricks
My freezer - a small chest unit, is almost full of paper to the exculson of food. Most of it is a result of friends giving me supplies as they move to the d side.
Double bag the long term store ones and then seal the outer bag, over the box with masking tape before freezing. Mark the tape with a sharpie marker as to what is in the box. This prevents the box from absorbing moisture and swelling, and thus keeps a source of moisture away from the paper when it is time to thaw. I do this when I have, say 3 boxes of polycontrast 100 sheets of 8x10, and one of 250. All but one of the 100's gets double bagged. The double stocks go to the bottom of the freezer, or under the freezer basket.
Try to stack paper on end, so the labels on the end of the box can be read. It also allows for one box to be removed without unloading half of the freezer.
I try to unload into 25's envelopes, and keep the envelopes in the film fridge. They warm up a lot faster than 100 boxes when it is time to use the paper.
I try to transfer from the frozen box to the envelope out in the garage in the dark at night on a cold night. that way there is little moisture in air, and therefore less to condense on the equally cold frozen paper.
Most chest freezers have the condenser coils in the top half of the outside wall of the cabinet. Feel where the outside is warm when the freezer runs and is cooling goods. Below that level it is fair game and a good idea to beef up the level of insulation. I use 2" rigid SM type foam boards. I also have one that sits over the top of the lid. They cut the amount of heat that leaks in, hence the compressor runs less frequently. This same technique is used on the bar fridge that I use for currently open envelopes of paper and film.
Inventory what is in the freezer and fridges. Put the list and a pencil close at hand to the freezer. That way you do not need to open the thing and dig like a mad man when you used up what you thought you had stashed, and allows for better stock rotation.