Recover emptied trash gmails

Hello,
I was using my brothers phone between phones, and when I got a new one I thought that I sent everything that I wanted and needed before clearing everything from his phone and giving it back to him. So I even emptied the gmail trash out. But unfortunately not everything went through. Now I need some of that stuff and don't know how to find it. Can Someone Please Help Me!!!???
Sincerely Seaking Help,
Christine Garcia
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