Here are the rewards he got from all 100x times cracking the safe :
28x Bottle-nosed Dolphin (Animal 98/54)
23 x Monofin (Armor 100/60)
21x Dolphin Submarine (Vehicle 55/98)
16x Charging Bull (Animal 52/97)
12x Half Rack (Weapon 97/60)
Once you crack the safe and collect your reward it resets when you refresh the game and you can play it again! so get inviting and get some pretty decent loot!!