and good luck getting these if you have boxed f:nv. i seem to notice at least two topics with this issue on the first page of the f:nv dlc hw & sw issues forum...
i am going to go and add to one of these
As there is no difference between boxed FNV and Steam FNV I don't see how that would create a problem?
(I bought a retail version, for the box, but only entered the key, never used the DVD, only used Steam).
Edit: The only reason I can think of is if you bought the game outside your region and there are some restrictions in your region, or something like that.
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But it's a good deal, 2.99 for the DLC. a shame I already have them, but that's the price you pay when you want stuff early