Actually, it is most often not a scam. Many overseas buyers use legitimate, tax paying USA overseas shipping companies to forward their packages. Several are located in California and others in Michigan, New Jersey, Delaware and a couple of other states that I am not remembering. It is absolutely okay for eBay sellers to ship to those locations in the USA no matter where the buyer is from, whether it be Italy, China, or Timbuckto.
As for mcitinner1's issue, I suspect the buyer wanted the shipment sent to Italy but forgot that they had their USA packing/shipping address as their registered eBay address. It is less expensive for them to have the goods shipped directly to them in their home country as they pay a fee to these shipping houses.
I will sometimes get overseas eBay buyers whose address is actually overseas, but they bypass my "USA Shipping Only" rule by having a registered address in the USA which prevents the USA Shipping Only block on them when they bid. Sometimes, I get a follow-up email asking if I will ship directly to their country. Unless it is a really high dollar pipe that is worth my time to ship directly, I will politely decline.