As (bad) luck would have it, I became a victim of this problem myself for the second time in two months, just a week after adding to this thread.

Last week I ordered an assortment of soaps from SRD. I payed for priority post (USPS). Four days later (after the shipping notice) the package still had not arrived. Thankfully, just as I was getting ready to raise the issue with the post office, a neighbor I had never seen before knocked on my door last night and brought me my package. The carrier left it at the wrong house. I'm still going to file a complaint. With the misdelivered packages over the last two months, that amounts to nearly $400 of goods that would have gone lost if I hadn't thought to check with neighbors, or if they hadn't been honest enough to bring it to me!