I bought the Golden Edition of Hitman 2 and bought the first part…I have a complete set of the game but for some reason I do not have Travel briefcase
You have to own HITMAN 2016 game to have this briefcase.
If you have it, once you launch HITMAN 2, you should be awarded with it
You have to own Hitman 2016 and have redeemed Legacy for free. The briefcase is only given as a reward for those who redeemed Legacy.
Purchasing the GOTY Legacy Pack will not get you the briefcase.