"I sent out worms to a lab, and they verified that these were worms, but, dead. Since they were dead, they could not identify them because, when alive, they excrete certain things, and that's how they identify them"
Something about this is making me think the lab is jerking you around. I've never heard some worms had to be identified by their excretions. Sounds like they are saying many worms look alike under a microscope, but are actually different. Even if true, wouldn't seem to matter about which treatments to use to rid them if they are the same class of worms.