By law they have to disclose EVERYTHING!!! If they have a problem with filling out the form, that should be a BIG red flag. Consult a Realtor to represent you. She/He can take care of all that for you and negotiate the best price on a home as well as provide information and guide you while finding the right property. You should never purchase a home without a RE professional. Their services cost the buyer nothing and you have someone looking out for your best interests.