Lockit boxes are GREAT…. if the operators know what they’re doing.
In my experience, these kinds of offsets are NOT due to something that happens in post. It’s usually some kind of incompatible setting, despite what the audio guy says. (Usually happens after lunch when everyone resets for the afternoon)
If the shoot is on going, make a field trip to the set and follow the signal path from TC generator, to audio multitrack to cameras. Everything has to be spot on for this workflow to be automatic. One incorrect setting and you’re back to manually matching everything up.
Make them PROVE to you that their settings, cabling, and references are correct. (Better to be a dick than to spend YOUR time fixing their problems).
I’ve begun to demand that the tech super on set email me an iphone pict of the settings panel on the camera, decks, and TC generator BEFORE they start shooting. You’d be surprised how many mistakes we catch this way.
Good Luck.
mark