These guys are creatures of habit. They often run a little theft route on the same day each week at nearly the same time. If you were a hunter, he was a large buck, and you knew he worked the same trail every week you would....
The cops don't care about this stuff at all but Postal inspectors take it more seriously. Send em the pics and ask for some help. Those card transactions should be traceable.
This should work also:
http://gizmodo.com/5691724/how-to-track-your-vehicle-on-the-cheap