These Hidden Packages can only be obtained at the Altruist camp after Trevor delivers four victims. During the shootout, there will be FOUR briefcases that show up in the camp withR$25,000 each! Be sure to take both because this will be the ONLY time these packages spawn!
In total, collecting all 54 Playing Cards in GTA Online will earn you 66,650 casino chips. With all 54 Playing Cards collected, you will also unlock the exclusive High Roller Outfit and a unique set of Playing Cards that can only be used by your Penthouse suite dealer.