SVonhof Yeah, not sure how they do that with some items. The World's Largest Mailbox that they have, had to be in actual use. Someone ran 1 block to the P.O., mocked up a letter, stamped it, and then the postal employee ran over and delivered it to the mailbox, after cancellation, all the while the Guinness people were waiting. That was all it took for verification. I doubt anyone wore the clogs, or threw some cowshit with the pitchfork, but they got verified also.
They do daily pickups from that mailbox now. Visitors can send postcards from there, all hand stamped with a special 'World's Largest' cancellation(or whatever it is called).