[shahadi]

Solution found.

The scenario files maintain the formations although the custom oob was overwritten. In ScenHack Scenario Utility, I was able to identify each formation and the respective units from the Formations tab. In the Scenario Report window, I was able to find the oob index for each unit of the formation. Also, the Formations tab returns the name of each formation.

Taking this information to Mobhack OOB Editor, I was able to recreate my custom formations.

Lessons learned. Save off custom oobs for each scenario in a special folder in WinSMBT. Or, you could save your game data for each scenario.

Special thanks to cbreedon.