The handicap committee should assign a "special handicap" to these two individual in any future competition. I have seen this done at my club and in a men's club I belong to. If the handicap committee doesn't react to these situations they will soon find no one willing to compete in any handicapped tournaments.
That's exactly how the NCGA (and probably all USGA affiliates?) handles it. They have all of your revision scores listed, and then below that they have your two lowest tournament scores. My understanding is that if you show any pattern of posting scores for non-tournament rounds that are significantly higher than your posted tournament scores, the NCGA will assign you a special tournament handicap that you must use for official competitions.