Were you searching for Abandoned: Discovery Island's version of Corruptus' counterparts, Photo-Negative Mickey, The Face, Suicide Mouse, Willy, MickMick, or True Mickey? or perhaps his Revision 1 counterpart?
Corruptus is the true secondary antagonist in Five Nights at Treasure Island: Found.
Corruptus is a combination of Photo-Negative Mickey, The Face and Suicide Mouse, with holes where his ears and nose should be and eyes that almost make him look possessed. He also hovers over the ground. He only appears on Night 1, If you find the key in chest from Pirate Caverns to escape from Photo-Negative Mickey in Bad Ending.
Corruptus glitches every camera he enters, even the Office, with that being said, it's easier to detect if he is on your Office or not. If you hear his not-so-clear voice and he is standing next to the sign or in the left doorway of the Office, you need shut off camera or shut off power. If you hear his voice more clear, and he's right in front of you, you need hide under the desk, but not for so long, or you will be attacked by Slester. If you shut off the power, you need to listen to Corruptus's voice. If he's in the Office and you hear his not-so-clear voice, you must stand still. If his voice is more clear, you need to hide under the desk. When Corruptus attacks the player, Photo-Negative Mickey, The Face, and Suicide Mouse will simultaneously appear in the Office for a split second before the player is grabbed by him.
The following audios will make a better understanding of where Corruptus appears in the Office.
When Corruptus is at the left side of the Office saying "Let's have some fun."
When Corruptus is at the middle of the Office saying "I know you're in there."
When Corruptus is on the Desk (Clear Voice) saying "You can't run away from me."