Closed a wallet in Multibit mac and cant find it from application support
Are you sure you looked in the right folder? The path should be: /User/your username/Application Support/Multibit/xxxx.wallet.

I didn't find my wallet because I made the misstake to looked directly under root: /Library/Application Support/  and got rather stressed but I found the path eventually.

This cataloug is hidden and you have to unhide it with the commando in a terminal window: chflags nohidden /Users/your username/Library/Application Support/