I believe I've already recounted the time a fellow came (via invitation) to my "Compound" (home, which is out in/surrounded by National Forest) for training of his dog, "tracking" to be specific. Attending an open-to-the-public, Chapter website announced training day, he brought a dog I think could have easily been a loaner from the pound. A trainer at these soirees, we divide up for different focus and I usually do the "tracking" form. But mutt or not, scratch a dog and underneath is some wolf so when he seemed interested in getting his pooch to track, I invited him to come to my place where I have a very specific, "fast-track" area and birds used to get dogs off to a solid start.
He got to see everything of interest I guess... my kennel, "hobby hut" (with still) and during conversation during which I related how my Dad's brothers had been LEOS (police, training at Quantico, DEA, elected Sheriff), when asked directly what he did for a living... FBI. Never saw him or his dog again.
My guess?
Flagstaff resident agent, tasked with checking out a list of individuals given him. One name checked off, brief report attached.
Paranoia?
Perhaps.