After three years of searching, I've finally found Cryptopone gilva once more. I collected the colony out of a moderately decayed White Pine log on 3/21/22 after several hours of digging through wood and aspirating workers and larvae out of the many random tunnels these ants inhabit. I came up with roughly a hundred workers, several dozen larvae and a single dealate queen in the end. So far they've been pretty great, living in a petri dish nest and feeding baby mealworms to their many hungry larvae.
Pics coming soon!