Treasure Chest Opened After Watching Ad

I opened it after watching an ad. From the Old Treasure Chest in the Elf Forest, I got 10,000 Experience Potions. That's an 18% drop rate. Well, yesterday I got gems, gems. Old Treasure Chest in the Elf Forest Item Probability 500 Coins 0.1% 3,000 Gems 1.5% 5 Gem Booster: 1 hour 1.6% 5 Gem Booster: 30 min 2.5% 1,000 Gems 3% 500 Gems 5% 10,000 EXP Up 18% 5,000 EXP Up 28% 3,000 EXP Up 40.3%