I bought this a couple of days ago because I thought it would perfect for storing my gold when I hit max. This would be great for the gold donation contests. The thing is when I equip it says bonus money in the bank. How does this work? AQ doesn't have a bank to store your gold, unless this is something the devs are working on.
You just sell it back for 1 billion gold when you need the gold like during a donation contest or on another level 150 guardian on the same acount via vault transfer of the chest. There is no planned gold vault as far as we know only the current token and item vaults. Also like the description says it has funny popups when you click the misc but it has no stats.
If you don't mind I'll share some related bits of info since you seem interested in donation events. Also you can vault as many of the same item as you want so you can store tens of gold storage chests if you want and it's part of how people get so much gold for donation contests. Same with logging in and completing a battle everyday during the events on a few characters that are leveled up with level 135+ having the best chance at receiving a lot of gold since gold donations have a 15 level range between giver and receiver. Token donation events instead have a simple level 25+ requirement to receive donations.