There was a powerful organization from Division2 that was there to back the Mystery Auction up. After all, it was attended by all the royal members as well as the high-class royal families, so basically, nobody would dare to create trouble at the auction.
Everyone knew very well that creating trouble at such an auction would be pitting oneself against the royal members. It would even offend one of the powerful organizations in Division2. Even the underworld organizations that were normally the enemies of the royal family dared not do such a thing at the auction.
Also, the Mystery Auction was heavily guarded every year. There would be two guards on immortal-level. One of them would be stationed on-site while another would guard the warehouse where the items were kept.
The auctioneer, the guards, and even the ceremony presenter girls were on holy fire-level. There were about 30 of them. The rest of the staff assistants were on complete gold-level.