A good investment may be indulging in a 6 or 12 month experiment..
That would be good, I've heard some small group is doing it somewhere. It really needs to be done with scientific rigor to put an end to this question once and for all, but unfortunately, science doesn't have much of an interest in the storage conditions of illicit peptides.
So as of now, pharma peptides outside of lab use are stored in warehouses, shipped, and kept at pharmacies at refrigerator temps.
The data I presented came about just a couple years ago because USP wanted to figure out how to handle the pharma peptide reference samples they use in house and sell to manufacturers (so they can certify their drugs as "USP" to be sold in US). In this environment of uncertainty, the universal gold standard in peptide storage has been -80c in certified ANSI lab freezers, since that's well below any possible freezing temperature of the moisture in peptides (which is lower than pure water, like all water containing contaminants), and there's no chance of thawing and refreezing with small temperature shifts inside the freezer.