I agree with Dick.  The actual dollar value may be on the small side, but the numbers will add to the perceived value of any sale.  The immediate effect makes a one-of-a-kind presentation and the leverage for a potential buyer will be weakened.  On the down side, the rifles can't be sold individually unless the condition is so stunning as to make each one unique.  The combined value of the two gun sale will be slightly greater than the total value of the two if sold separately.  Finding the right buyer will be more difficult and a combined sale will likely attract dealers before individuals with the funds to buy two.  If the condition of the rifles is as you described, that adds to the difficulty of finding a single collector with the urge and the funds, too.  Since the rifles are only 5 numbers apart, that might make any situation more challenging.