@jor860
Do you plan to efile your return? If so, the beauty of efiling is that in most cases, no paper forms have to be sent in at all. The only time you would have to actually "attach" a W-2G is if you were paper filing and the W-2G has any federal income tax withholding on it.
Of course, you do have to report the W-2G by entering the info into the TurboTax program.