Gem Values
Normal – 330B
Gold – 420B
Rainbow – 1.3T
Shiny – 2.5x base value
Demand – High
The Huge Chest Mimic was obtainable from season 1 dlc gifts (mystery pet collector clips). Your best bet now is trading other players for this pet in the trading plaza or join my discord to ask someone if they have one. Click the join now button at the bottom of the screen to join.
If your pet has the shiny status, use the values listed at the top of this page and multiply it by 2.5x. Why do we use this logic? Well the pet is 2.5x stronger then the base pet, whether that be normal, gold, rainbow, or dark matter. So for example if the pet is gold and worth 10m gems, do 10m x 2.5 = 25m gems. So the shiny value would be worth 25m gems.