The Tauschbox is a community project where one can drop off unwanted items (usually clothes, books, and small things) and pick up something too. There had been a Tauschbox formerly located in the Stadtpark area but after vandalism issues, the Stadtteilbüro now houses a smaller version that can be rolled into their building during closing times to protect it. Here's a link to what I wrote about the original edition.
This is the new(ish) Tauschbox; see the flash of yellow? That's it.
Interested parties can visit the Tauschbox during the Stadtteilbüro's opening hours; check out their website for more information.
Stadtteilbüro Innenstadt West | Königstrasse 93 | 67655 Kaiserslautern