October 10th, 1972 Male Missouri

I am searching for my half brother born in Missouri on October 10, 1972. I have lots of information on him, but am unable to obtain any records. Public searches lead to dead ends or no results found. Contact me at brian.mccullough@hotmail.com if you may be able to help. I have the city, state, county, month of adoption, mothers maiden name, mothers dob, mothers address, possible adoption agency and more. Thank you.