"Briefkasten existiert nicht mehr"
The place has gone or never existed. A user of Organic Maps application has reported that the POI was visible on the map (see snapshot date below), but was not found on the ground.
OSM snapshot date: 2023-07-10T17:38:00Z
POI name: Königsberger Str. 150, 24376 Kappeln
POI types: amenity-post_box
#organicmaps

Unable to answer "What’s the height limit here?" for osm.org/way/79865733 via StreetComplete 53.3:

Kein Schild

Unable to answer "What kind of building is this?" for osm.org/way/92002011 via StreetComplete 53.3:

Waschanlage der Tankstelle

Unable to answer "What are the opening hours here?" for osm.org/node/3099934091 via StreetComplete 53.2:

Bekleidungsgeschäft Pa Petter

Attached photo(s):
https://westnordost.de/p/161578.jpg

"Es handelt sich nicht um einen Kreisverkehr, das VZ 215 fehlt."
OSM snapshot date: 2023-02-27T13:03:31Z
POI name: Herdecker Straße
POI types: junction-roundabout hwtag-lit psurface-paved_good hwtag-nofoot hwtag-oneway highway-primary
#organicmaps

Unable to answer "What kind of building is this?" for osm.org/way/54554120 via StreetComplete 50.2:

AWO Gemeinschaftshaus

Attached photo(s):
https://westnordost.de/p/131940.jpg

Unable to answer "Does this pedestrian crossing have an island?" for osm.org/node/9473333314 via StreetComplete 50.2:

Kein Fußgängerüberweg

Attached photo(s):
https://westnordost.de/p/131946.jpg