Sorry Buddy, I don't think Kraken exchange has nothing to do with, otherwise tells you to be careful when performing transactions, but I just hope you will be answered,
What if I want to close my account.
Will they get my private keys ?
This makes me nervous a bit
This act isn't necessary, and I don't think your funds it will be recovered either, I have perform this silly act before by transferring AENCO to wrong address in Kucoin from MEW, the money was gone forever till today,