Crazy people... they get crazy. Camp out at the PO box and wait for someone to pick up the mail. Get a job at that UPS store location. Pay off one of the kid employees that work there to give you the name and address on file. Follow the person that picks up the mail home. Look up his information based on his home address. Collect all his trash, find out where he works. follow him to work. then wreak havoc on all his coworkers!
you are really not all that creative are you... :)
Well...it looks like I'm not going to be sending you any patent infringement paperwork (whether it is legit or not)! Although, for somebody who has just snapped and is going to wreak physical vengeance, I wouldn't put a normal thought process behind it. Which means you may not be able to count on logically thinking and finding these people.
Mentally ill or "crazy" people may still be able to think logically. Having experienced psychotic episodes that included planning "bad" things, I can assure you it did not interfere with logical planning. Recounting it later, the clarity of thought was quite clear, disturbingly. The Unabomber is a well-known example.
Someone's goals, utility functions, and even certainty values for some beliefs may be very different than "normal", but it doesn't mean they aren't able to reason logically within those constraints.
you are really not all that creative are you... :)