He's right. I've downloaded them, but can only play on them when i'm signed into his Live account. Which is a pain as they are on the system, so i'll just have to do it another way I guess...
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Then complain, they are allowed to be put on three machines using the same account, it's in Treyarchs t's&c's about map packs.
Just sign into his account on the xbox, you don't have to be online.
He's borrowed a console off one friend, borrowing an account off another. He can still sign into the account when offline.
The way I do stuff like this is with my memory card, just put it on memory card, transfer to hard drive and put under cod WAW :)