What most buyers do not realize is that they must specify the mailing address for a purchase before they make a purchase.
This is done on eBay.... The Paypal address is linked to the address on eBay and cannot be changed on Paypal.
If the address for both purchases is the same. on eBay and then on Paypal... then that is the mailing address for both purchases..
Send the buyer an email explaining the situation... and included the same information in the parcel with the purchases.
A seller mails the purchase to the Paypal address.
You as the seller cannot ship to Germany because the address to Germany was not specified as the official address on Paypal.
Make sure all of your communication with the buyer is through eBay messages.....
and then put this buyer on your Blocked Buyer list.