Talk:Cozy Glow/@comment-36700661-20181203170421/@comment-29981995-20181212213144

If anything, School Raze alludes to the moment when Cozy stole the artifacts:

Cozy Glow: Uh-huh. I told her how busy you are and how much her loyalty meant to you. I also color-coded your teaching schedule by friendship element and catalogued all the magical artifacts in the school. I hope that's okay.

By this point, Cozy had wormed her way into Twilight's trust, so Twilight had no reason to suspect her of anything. Plus, it wasn't until after Friendship University-presumably-that she and the Young Six discovered the cavern under the school. Given that said cavern is where she set up her magic-draining siphon, it seems unlikely that she would have taken the artifacts prior to that point.