It could be anything. Two things for sure, though. One, ethical sales people don't sell under false pretenses, like pretending to be "code inspectors." And two, after the kid was done his "inspection", he would know if you have valuable stuff in the house and the general layout of the place. It's unlikely he was actually there to case the joint, but that point is nonetheless true.
EDIT: How the hell did "false pretenses" become "fall pretenses"? More autocorrect?