Help me kill these owls

[Kurollo]

So, there's this game called Abyssrium: The Classic, i've already made a post about it here with some cheats i found

the thing is, i need help this time to delete an Owl

But is not only one, is 90 of them, this ***** game has some package creatures that can not be stored, and thats fine cuz they don't count towards the max limit anyway

Every package creature besides about 2 of them appears in the creation tab, meaning you can have more than 1 copy, BUT THIS ***** OWL IS THERE TOO, so i made 100 of them and now i cannot store them
i've already tried doing the reverse thing by switching an item from the shop with it and changing the value to -90, but the only thing it does is lower their numerical value, i still have 100 in the tank and i'm going crazy rn I WANNA KILL THEM 

the creature is Curator Owl btw