All I am going to say is this, most drugs for long term storage is as follows, cool, dark, dry place, most drugs store between 45°-65° with the over lapping at 50°f. One of the biggest problems is the moisture, and if there in a frost free freezer, the freeezer goes through a defrost cycle every so often where the unit actually heats up and the fan comes on to help evaporate moisture in the freezer. When you take something out of the freezer it will crest moisture, the moisture will break down the coating and ruin the drug, also every time the unit is opened hot air rushes in, in most units as the cold air flowers out. There are temps that I have seen in the past, I will see if I can find the info. Any way, just saying!
Good luck, be safe, and God bless