Yeah! They were looking for the shoes at 4JC. THOSE SPECIFIC SHOES.Doubtful. If it were Jennifer's shoe print, they'd have mentioned that. No sense not to do so at the point that info was released.
The fact that they don't state whose it was (and we KNOW they know, IMO!) leads me to believe it was MT's (she wore that type of shoe, after all, no?) or Fd's.