The Orange Box != TF2
The Orange Box = TF2 + HL2 + HL2: Ep1 + HL2: Ep2 + Portal
If you're getting it only for TF2 though, don't. It's "Vanilla TF2" and gets no updates. In Dusty's case, this is good. In most people's cases, this is not. If at all possible, buy it for PC.