Would you believe a $20 bill? a tooth? a can of pea soup? Here are some more from the postal experiments.
We sent a variety of unpackaged items to U.S. destinations, appropriately stamped for weight and size, as well as a few items packaged as noted. We sent items that loosely fit into the following general categories: valuable, sentimental, unwieldy, pointless, potentially suspicious, and disgusting.
We discovered that although some items were never delivered, most of the objects of even highly unusual form did get delivered, as long as the items had a definitely ample value of stamps attached. The Postal Service appears to be amazingly tolerant of the foibles of its public and seems occasionally willing to relax specific postal regulations.