Tesco used to always sell new 360/PS3 games inside a large case which they had to open at the till.
I bought two games last night, where the empty cases were out on the shelf, and the cashier had to find the disc and manual out of the back.
The old method was great, because the game cases were pristine and sealed. Now, you get a potentially worn case with no seal.
Since Tesco are now buying games in, it makes me think that this is either completely coincidental timing, or they're doing something incredibly dodgy here.