How to provide proof of USCE

Hey guys I'm a foreign medical graduate. I did all my cores in my home country but did all my electives at u.s hospitals. Only problem is that my transcripts and deans letter don't show location of hospital so program directors have no way to prove I did it in the u.s without taking my word. I have evaluation from preceptors to prove it. My question is how can I show them I had u.s clinical training on my application so that my app doesn't get screened out