Oh, so they were completely dry? Completely fine. My mistake.
Microbial degradation is the big worry with peptides, since they're proteins and most common environmental microbes have no trouble cleaving proteins and eating the amino acids. That's essentially not a concern without water available. Some people reconstitute in sterile water, without any anti-microbial, which *can* work if you keep your shit cold all the time, but is a disaster otherwise -- lose your shit for sure, give yourself an infection pretty likely.
But nah, you're good.