20th Anniversary Balloon Chest
Source: Vendor. I bought this stupid thing because I admittedly didn't notice that it cost Bronze Celebration Tokens, not silver or Darkmoon tickets like you know, all the other ones.
The 20th Anniversary Balloon Chest is a toy available from a vendor during world events that costs Bronze Celebration Tokens.
Guide awaiting review
Locate the vendor
Find the world event vendor who sells this toy during the 20th Anniversary celebration.
Purchase the chest
Buy the 20th Anniversary Balloon Chest for 
10 Bronze Celebration Tokens. Note that this item cannot be refunded or sold back after purchase.
Tips
Ensure you have enough Bronze Celebration Tokens before purchasing, as the toy is non-refundable.
The balloons from this toy may not be visible to trial accounts or other players in some cases.
