Pull everything out you can, wash it with bleach and soap again and take the door off. Take the seal off the door and/or freezer and replace it. Get some fish tank sealant and plug every hole, crack etc. Let the whole thing remain open w/o the door for a couple of weeks. Reassemble, go to the local wood store and get some scrap cedar, doesn't have to be Spanish, and just toss it in with a bowl of water. Now get a couple cheap cigars and put them in Tupperware without the lid, place that in the freezer. Wait a week. (Don't worry about actual RH).
Now open the freezer and smell. If it smells like plastic only, that is a problem. If it smells more like cedar with only a little plastic you should be fine.
Now try the cigar. If it tastes like plastic, your done, if not build away.
Once you line the thing with Spanish cedar you should be all set presuming you had little or no plastic smell/taste from the test.
Also, if both freezers have the plastic problem after the test go to Home depot and buy some vapor barrier, put that in, then a layer of really thin, 1/4 inch or less, cabinet grade plywood, then the Spanish cedar and you should be all set. Or just do this from the start after you have disassembled, cleaned, sealed, aired out and reassembled.
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