Wow. I've had a bunch of old gear come and go, but have yet to encounter anything crawling or flesh eating. Occasional spider web, hairball, nondescript goobers, etc.. are more the norm. If it were me, I'd probably try to carefully delouse that case- spray the hell out of it with white vinegar (should kill eggs in the event those things are spawning in there), let it air dry, and then wipe it down with a moist rag to clean it out, vacuum, etc... I've had to do that to a couple cases that smelled like Keith Richards had passed out in 'em.