Well, I've gotten a little more detail on how this scam works.
A seller will post an item on eBay and the purchase will go through like normal. When an item is sold, the seller can get a pre-paid shipping label from eBay. So, at that point, the seller has a legitimate shipping label. But, via the wonders of image editing software, they will manipulate the address on the label to some address near the buyer, but not on the same street. They will also modify the tracking number digits, but not the bar code. They'll also change the name of the recipient. So, instead of my name, the name was changed to "Attn: Online Customer". Then they'll print that edited label and use it on the package. The package itself will also be fake. In my case, USPS told me the item weight was only 11 ounces - way less than a Fender Stratocaster in a case and packaging! They also picked an actual address on a street about half a mile away from me. But, that person did not get a guitar, they got this fake package. That person is probably scratching his head, too.
Well, since the item is on its way to your same city and zip code, all will look good while you're using the USPS tracking system. Also, since an actual package is going to an actual address, when the postal carrier scans the item as delivered, it is a legitimate scan. The scan will show it as YOUR address, because that is what is referenced in the bar code. Where things go awry is that the mail carrier will deliver packages based on the printed address. Now, the mail carrier could look at the address on the scan and see that it is different from the printed address on the label, but most mail carriers are too rushed for that. They just refer to the address on the label. And, even if the carrier did notice a discrepancy and did deliver it to the correct address, it doesn't matter because it isn't the correct item, anyway. Of course, we all know of cases where items are scanned as delivered, but don't show up for a few days, so the buyer will usually let a couple of days pass. Then, since the package did come to the correct city and zip code, the buyer will spend more time asking the neighbors if they got a package. So, this delays the claim process.
So, where it gets tricky is that eBay and/or PayPal will reach out to the seller. If the seller responds, the seller could demonstrate a correct, legitimate shipping label! Of course, it would be prior to being manipulated, but it would be correct, nonetheless. In my case, USPS did send me a copy of the actual shipping label used, so I can prove that the actual destination is different from my address.
In the end, although I entitled this thread as "Irritated at the USPS", in reality they aren't the problem, at all. They may actually be the one saving grace that helps me get my money back. So, my apologies to them.
Anyhoo...the next couple of weeks will be pretty interesting.