There is tag "Album Complete?" already available which returns "Y" if the album is complete, "N" if the album is incomplete and "?" if it cannot determine one or the other.
The only issue with that is that both these tags
need to be populated to get a correct result. If the second one is missing you'll get "?", if some tracks out of the total are missing you'll get "N" and if all of the track are there you'll get "Y".
So you just need to make sure that all your albums are tagged correctly and then it's as easy as defining an exception rule in Auto-organize using the "Album Complete?" tag as a criterion but
organizing manually is probably the better option since usually you can't be sure that tracks are fully tagged from the get got.