I decided to call USPS. The woman I spoke to informed me that it could take up to a month to clear customs in Hong Kong and then another month to clear customs in the US and THEN it could be shipped to me. In other words, I was looking at upwards of 2 months until the package arrived and there were 10 days until the wedding - probably not going to work.
In a panic yesterday morning, I emailed the seller and ask if she could resend the same order with express shipping (at my expense) after explaining the whole situation. About an hour after I sent this email, I received an update from USPS, informing me that my package was in NY at a post office only about 4 hours away. So in a matter of an hour, my package went from a sorting facility in Hong Kong, through their customs, through US customs, and made it's way to NY. Talk about fast service. Fortunately, I was able to message the seller and tell her that everything was alright and the package would arrive on time.
Morals of the story: (1) Don't trust USPS tracking and (2) start early if you're shopping online (and allow over 2 months if your package is coming from another country). Lessons learned.