Yeah I saw it as well. Apparent it is not the first time either. I guess it happened in the mid 2000s. 

Wizards has had a lot of issues of unreleased sets getting set out, there for a bit there was some in boosters of unrelated sets. Not entirely sure of the whole story but regardless of whether or not the guy should have had the cards, from the bus I've read the means the Pinkertons used to get the product back was unnecessary.