I know it's too late now, but using a home inspector or any other services suggested by the real estate agent (i.e. financing) is usually a mistake. You have to do your own due dilligence. You simply can't give your trust to a realtor.
About the DOM, if they told you an incorrect or false DOM number, that is fraud. If they never actually told you a number, that is shameful. When a buyer asks for information, it should be provided quickly and accurately. If not, beware.
You should should ABSOLUTELY file a complaint against the realtor with the BBB & the Licensing Board at a minmum. It's easy to do and will help protect other homebuyers.