I'm not saying they were from Kirby, but.....
I used to work for them. Actually, none of their salesmen work for them, they are all independent contractors, at least at the franchise where I worked. The sales tactics used vary widely, and they have alot of sales people who work completely independently. They sound legit to me, although, the bit about the books sounds odd. However, I don't see why anyone casing houses would switch stories, it means you have to carry the equipment for multiple BS stories.
However, when I was working for them, I realized that I basically was casing all the houses I was in. I knew which houses had expensive valuables, I knew which houses were leaving their garage doors open, and I knew which houses had to unlock their doors before opening them. Legitimately working with them would be a great way to case houses, so be careful.