Lucky 38 VIP keycard

 is a miscellaneous item in Fallout: New Vegas.

Uses
It's used for opening the hidden door in Lucky 38 Penthouse. The keycard is not necessary for the door to open, if the player has a Science level of 75 (or lower, raised by chems and apparel) to hack the terminal. If the door is opened, all Securitrons turn hostile towards you. Inside, you'll find another terminal without need of keycard or science level. If the player goes down the elevator to Control room, the player may kill or disable Mr. House there.

Location
Once you enter the house resort walk forward in to the room with the two soda machines the Nuka-Cola and the Sunset Sarsaparilla. Open the door on the left and the it's on the desk.

Also found in H&H Tool Factory on top floor.

On Chief Hanlon desk at Camp Golf at the end of Return to Sender.