If they are telling you that, then it may be a low serial #'d gun that had the suspect heat treatment/brittle receiver? Might check on that. IF that is the case, it is MUCh more valuable if restored to military configuration and sold as a collector. If not, then it's value is still marginal, as it's been 'sportorized'. Were it mine, I might save up for a true custom built off of it. That, or put it back as close to original as possible and shoot NRA service matches with it. Just me.
You likely have a very good gun, but it's going to be undervalued because 'sporterized' is a dirty word right now with regard to military/surplus bolt rifles.
Here's a thought: Let the ducks work and decoy.