Tool for detecting and removing duplicates? [Available in 8.10.18]

I came here because I, too, moved my Primary vault items to my Private folder. 850 items, all seemed to be duplicates. Fortunately, I'm still with 1Password 7 for Mac, so my removal tool took away about 550.

@"Chris Messina" , I think one method for you might be to Move everything over to a new Vault. Then, as you use items, move them back into your Private vault. This will cut out you seeing the duplicates as you slowly build your Private vault back up.
It's sort of like moving everything from your e-mail Inbox to a separate folder. Then work towards keeping your Inbox emptied. The stuff is all still there, but not right in front of your face causing havoc.
(Gosh I hope this makes sense.)