The Huge Chest Mimic is an EXCLUSIVE pet that is available from the Season 1 Toys DLC Codes. There is an unknown chance of redeeming this pet from an Exclusive Tier DLC Code. It has the Best Friend and Random Enchantments. It was released in an update on June 24th, 2022.
The latest Pet Simulator X value list for Huge Chest Mimic can be found below:
💎 24,000,000,000,000 (24t)
💎 55,000,000,000,000 (55t)
💎 95,000,000,000,000 (95t)
💎 Not Available