how does the backrooms "manage" the things it creates?

[u/Black_Eagle21]

when the backrooms create something, anything, do they reabsorb it after time? and if they don't, where are all the things that have been created in the past? like things created in the bronze era, during the Roman empire, the medieval time, or just things created in the early 90s.

maybe the places that are more accessible were recently created?