I've noticed more than a few items in the SW section at my local Target having heavily damaged boxes over the course of the last few weeks, and the Mace JSF and Vader TIE are just two of them. The Vader TIE I got there's box was almost completely crushed in on the back (luckily the ship was okay), and their case of the UL Hoth Snowspeeder and Turret sets was almost completely trashed.
That said, excellent decision on Hasbro's part to reship the already saturated Anakin and Obi-Wan JSFs in the case with the Vader TIEs and the Mace JSF. I'd bet someone a pickle that they reship those two JSFs again this fall with the AAT and Hailfire Droid because it would just be too logical not to do so.
Um yeah, I've seen the Vader TIE twice and Mace's JSF twice (once at Target and once, believe it or not, at Wal-Mart), and I bought one of each. They're nowhere near shelfwarming here, but it's mainly because the Anakin and Obi-Wan JSFs are already doing so.