I've seen SO much of this crap since 30AC, when I used to never see it at all. But most of the time it's just figures ripped open with the damaged packaging left there, as can be seen in these pictures I snapped from last year:
And the sad part is that these opened packages stayed on the pegs for WEEKS.
And off the top of my head, I've seen the following swaps:
-- Target Exclusive Wedge w/ X-Wing: SA Wedge swapped with the POTF2 carrying case Wedge
-- 30AC Tantive IV Battle Pack: RFTs and Stormtroopers swapped with POTF2 Yavin Ceremony Lukes (I still have a pic of this on my old RAZR phone)
-- Legacy Obi-Wan's Hut Battle Pack: New Luke swapped with a POTF2 ANH Luke
-- Various Iron Man 2 figures with "Try Me!" packaging: Limbs missing from some, others the entire figure is gone as seen above
-- Various BAD pieces stolen
-- A BAD figure with a Battle Droid arm instead of the BAD part
And I too have tried to tell customer service what's going on and am met with the same apathy. Eventually I stole an idea from someone on here, I want to say CHEWIE, where if you notice a swap, damage the hell out of the packaging so no casual mom/kid will buy it.