If you are reliable, then please repeat same what we did on youtube (on same bitcoin core version), put there 0.01btc and get it back. With results please share me directly. I think it's about everyone who are looking for reward.
So you havent the bak file anymore if i understood right.
Which version of MacOS is it ?
Did you already tried some feature of MacOS like time machine backup or this
http://osxdaily.com/2015/06/16/revert-to-prior-version-file-mac-os-x/ ?