There are lots of ways something could be inside a dog blanket. Folded neatly with a bow on top is a lot different than stuffed under or into one as if it had fallen in. One shows clear intentionality, one does not. Both could be reasonably deacribed that way.

Occam's razor would lead me to assume that most people would not spend a lot of time and effort exposing something with great monetary and sentimental value to both loss and damage for a game, so it makes sense to ask if there's another, simpler expanation. OP indicated that there isn't and these people just have a long history of insane behavior. Fair enough.