I got a METV in Boston in Dec. It is good until June 22, 2016. I recently got a new US passport and had the last stamp from Cambodia transfered to it at Jomteim immagration. The Metve from Boston was not transfered to the new passport . Can I still use it in my old cancelled US passport to enter and exit Thailand every 60 days? It expires June 22nd but is in a cancelled Us passport.

Visas are never transferred.

You must present both passports to enter/exit Thailand whilst the visa remains valid.