They would fare a bit better if you had put them into the deepfreezer
Sheet film 5x7", now that is serious business. I mainly used 4x5" and a few times 8x10", but costs were prohibitive for the latter (I used colour not b/w).
I think there still are a few sheets of 4x5" colour film in my freezer, but using them these days is more tricky as most film labs have shut down long ago.