"The location went bankrupt and has since been stripped down"
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: 2025-08-29T18:18:32Z
POI name: KupSam
POI types: shop-convenience
#organicmaps android 2025.10.05-7-FDroid

"inpost also attaches an official hint: "Po prawej stronie bloku, przy ulicy" ("to the right of the block of flats, by the street")"
OSM snapshot date: 2025-08-29T18:18:32Z
POI has no name
POI types: amenity-parcel_locker
#organicmaps android 2025.10.05-7-FDroid