Lots of “ifs” in your post. You are assuming arsenal rebuilds. I am assuming unit level replacement of parts, and a thoroughly used slide/grip set. IF the original slide/grip are still together.
My “ifs” are far more likely than yours....
It's my experience that all real 1911s and 1911A1s in even close to original shape are worth more than any of the recent clones.
I seriously doubt that a weapon found in an armory will be anything but collectable to some degree.
Some posters are making preposterous estimates like $200 and $500 - those prices haven't been around for colts since the 1970s (and those had Essex frames).
I have a special affinity for the 1911: I carried one in combat and I competed with another for a couple of years as a member of several Marine Corp shooting teams. I even owned one 1911 that was an original commercial 1911 from the 1913 production - 4-digit serial number with a "C" in front.
During an inspection of 50 preservation packed .45s in Hawaii several years ago, I found that they were all Union Signal and Switch .45s, with a couple consecutively serialized. I was Lieutenant back then, so the thought of theft only briefly crossed my mind.