Sounds like a two barrel set, 16bore double rifle
Were the gun barrels 12bore?
What type of rifling in the rifle barrels?
Barrel lengths?
Was this a cased set?
Bar action or back action or island locks?
What did the sights look like? Was there a flip-up peep sight in the action tang?
Cartridge trap in the buttplate?
Set trigger(s)?
Engraving?

Did you get photos?

I'm interested in hearing more!