ive gotten a couple of those wooden bark hide things, and both had bugs in them when i got them. just throw all your wood in the oven at 200-250 for a few hours, that will kill anything living in them. for now replace aspen with paper towels, soak the snake, and find a temporary plastic hide, and keep observing, and next time you find one of those bug things, try to take it off with some tweezers or something, so you can get a close inspection.