Unable to answer "Are the collection times of this postbox still correct?" – IP33 8237;IP33 237 (Post Box) – https://osm.org/node/1073108409 via StreetComplete_ee 63.1:

Two Saturday times. One 10:30am, one 12:30pm. 

Attached photo(s):
https://streetcomplete.app/p/345458.jpg