I know of many homeowners who had to come up with cash when they sold their home during the early 1990s. Obviously no one can accurately predict the economic future of real estate. In my opinion, real estate exuberance may produce similar results. We don't have time to sit back and analyze what we are doing. Seller reserves the right to delete the name of that third party offeror to protect privacy.
Seller represents and warrants that the third party offer is bona fide.
The direct answer to your question is that it is probably too late now to insist on proof that there was a higher third-party offer. The time to inquire was before you signed the contract at the higher price. Whether or not you decide to use an escalation clause, it is important to remember that you are about to engage in what might be the most expensive investment of your life. A contingency to obtain a satisfactory home inspection, performed by an inspector which you have selected. The right to select your own mortgage lender.