Help! FedEx asking for customs info

I just received the dreaded email from FedEx about a recent order of test kits. Order was about $400 (kits only, already have the device) and I used the US workaround. Altruan shipped these with no issue until they reached Memphis.

The email says US customs needs more information including:

1) Components of the kit needed along with its end use 2) Manufacturer name and address for item(s) needed along with their zip/postal code

There’s no form to fill out like others who have posted about this. Just these two questions.

Does anyone know how to answer these questions so customs will release my package? I’m terrified they’re going to ship them back to Germany.