Rigby

"A professional company assess the gun to 9500$"
When you spoke to them in Dec 2012. The gun MAY have been assessed earlier.

"which to some point might be an ok price for what it is. If the company had meant the gun was worth more, they would have sold it for more."

Not always. Quite a few people firmly believe in leaving something in it for the next bloke.

Secondly, it was only a few years ago guns were jumping
more than the $2200 in the same time period.

At the end of the day, it does not matter what a gun is advertised for, the value of the gun is what a particular person is willing to pay for it on a particular day. The next day, another person might be willing to pay more.

The day you start worrying what someone bought a gun for that you are interested in is the day you will probably walk away from a very good deal on a Double Rifle,
not because it isn't a good deal but because in your mind
they are making too much profit on it.
And you will be the loser.