Any information and news here ... ???
If they request an invoice, they just do that from time to time.
You should just not react and they are obliged to send it back....although I don´t really think they opened the package/letter as they are not alowed to do so!!! But if you visit them, they will have you open it.
So only chance is: do not react, they send it back, Mary can send a spare watch !
Dr. Theo