It has been my understanding that if you are traveling by air, and not exiting the airport, you are not required to have a negative COVID test to enter the US at these locations. I could be wrong but can't find anything to contradict this. No clue about ferries and seaport entry, where you will have more contact with the community (taxi providers, etc.). I emailed the USVI contact email address provided in their COVID updates/site for clarification but have not received any response. Most likely no one yet knows.