✔ 最佳答案
1. In most of the case, yes.
a. The current USPS record indicates this is a shipping label generated online. So it should have a tracking number (for domestic purpose).
b. It takes multiple stops for USPS to ship a package. As all stops require a scan on the barcode, it is extremely rare that a package is on its way to Hong Kong without any scans.
2. Yes.
3. No, unless it is sent as Priority Mail Express (EMS).