Its timely this old thread popped back up. (I solved the original problem/thread by upgrading to a larger Island Birds charter)

We just returned from VG and attempted to use Fed Ex to have a box of covid tests shipped to the island. The package sat for days in Tortola, making its way to VG after we were home. We were able to get tested at the villa so it all worked out in the end and I told the rental company to pass the tests along to someone that needed them.