In order to get anything like a realistic estimate of values, you would need to supply a lot more detail, such as serial numbers, to determine which series they are, and are the numbers on the triple barrel model all the same, plus what are the calibres of the other two.
Most importantly, you really need to supply pictures of the rifles showing condition of the stocks, barrels and actions.
You are talking about Air Rifles of considerable collectable value, but details previously mentioned will determine what sort of value.
If you aren't able to post pictures yourself, send them to my email address and I will post them for you.