In my experience, it is easier to see the drywood termite droppings, that they push out of the tunnels they've created. It won't always be a volume like in the photos. I've had a couple of machines, not only EM's, that have had termites. Some with minimal damage with no remaining active infestation and others requiring a trial by fire or maybe a local treatment with a termiticide(Termidor is what I use.)
I was told of this product some years back from an owner of a pest control Co, and have used it for wood decks or ?, where I have found the tell tale pellets. Simple to use, drill a couple of small holes in affected region. inject the product into holes, workers carry it on their body back to queen and nest dies.
Important to note that sometimes the structural integrity has been compromised beyond a functional or safe strength, so replacing damaged wood is in order. I had one where the termites were in the base of the head and the collar below it. The head damage was minimal, but the collar was toast(easy fix!)
dropping comparison (resized).jpgtermite-droppings (resized).jpg