reasure?

I was using this pet to get the cumulative treasure achievement tiers and I got it. But seeing as how it has 764 items in there, I don't want to individually click "remove item" you know what I mean? If I abandon the pet, will all the items appear in my inventory?

I just click really fast and don't let the page reload... It goes pretty fast actually But there is no other way... I'm not sure about abandoning, I think those items disappear... when I abandoned a pet it said remove all items...something something. WARNING WARNING

You are about to abandon your pet! Abandoning your pet deletes all the items attached to this pet including everything in the treasure chest, and weapons equipped for battle! Please remove these items before abandoning your pet.

Oooooooo okay thanks for letting me know! Yikes this is gonna take a while lol