07/08 artifacts - white unmarked cards with magnetic in packs?

[delacroixandora]

i bought a couple packs cheap today, got home and opened them...

i got a white card with what looks to be a magnetic square glued on or something ??

i don't know what this is?

 

[leafs4_cup]

It is an anti-theft device. They can also act as decoys.

 

[delacroixandora]

k thx.......