I found shrooms that have been lost for 6 years
I just found some shrooms that I obtained maybe 6 years ago. They were ground, placed into a plastic baggie with desiccants, and then placed into a thermos packed with a clean towel. I misplaced them, and found them with my camping gear, so they have been cool, no light, minimal oxygen exposure. So... how much can I expect these to have degraded?