What do you get from the Black Ops DLC "Mystery Box" in the xbox marketplace?

[SystemofRats]

its a mystery 0_o

 

[FrankFilips]

What do you get from the Black Ops DLC "Mystery Box" in the xbox marketplace?

There is a DLC for 240 ms points called Mystery Box. It says theres a surprise inside, but I don't want it to end up being some hat for my avatar or something. Does anyone know what happens when you buy it?
Thanks

 

[BlopHoe]

The surprise inside is a code for the next map pack. Entering this code makes you gain the map pack for free.