Where is best place centrally located to mail packages home? We are near Marienplatz. We will need a box. I have seen something about DHL from post offices, but where are they?
If you're still in Munich near Marienplatz and haven't solved your problem, you could try the following: go to Hugendubel Buchhandlung (bookstore) located at Marienplatz, across from Rathaus and near the Viktualienmarket corner. Somebody in there at customer service or a register will speak English and can direct you to a post office or DHL place. I bet you could even get a box from them. They also have a small English language books area. Unfortunately, they have lost their lease and will move out next spring.
There is a bundepost on the corner of Schützenstrasse and Schillerstrasse.
Sorry that is by the main hbf.
That post office near the Hbf. is in the Bahnhofsvorplatz area. There are also stamp machines in front of the entrance.