J.K. Rowling medger att det är lite av ett misstag att inte inkludera det, vilket anges på writeup på Pottermore .
The Marauder’s Map subsequently became something of a bane to its true originator (me), because it allowed Harry a little too much freedom of information. I never showed Harry taking the map back from the empty office of (the supposed) Mad-Eye Moody, and I sometimes regretted that I had not capitalised on this mistake to leave it there. However, I like the moment when Harry watches Ginny’s dot moving around the school in Deathly Hallows, so on balance I am glad I let Harry reclaim his rightful property.