Does German poste restante (aka general delivery, "Postlagernd" in German) require you to show ID to receive package or you can use just password instead?
Seeing that the German "poste restante" allows specifying a password instead of a name on the package, it should certainly be possible to receive a package without an ID check. Rough Google Translate of the relevant page:
The receiver's address must be structured as follows:
Name of the addressee or - in ordinary shipments - even passwords / pseudonyms etc.
John Doe or password: Blume69
So the answer is yes, as long as a password is specified on the package address, rather than a specific name.