I think if they do have a system to red flag certain addresses in Post Offices when you're standing inside them, receiving only one star is the least of your worries!I deal with the money side of things but I think if I were in the seller's place I'd probably just put the right amount of stamps on a package and drop it in a postbox late at night . I don't know how it works in the USA but in England we have to fill in a form and sign it ourselves to send anything by signature delivery. It would still be a prodigal leap from that to LE being able to track you down relying on the Post Officer worker's memory, security cameras and so on but why take the risk?V.