Box Turtle Sexing...

[Samba]

Hello everyone... I recently aquired another rescue, a box turtle. Former owner thought it was a male, but I am confused.

"Mike" has the red and orange colorings of a male, however, the plastron isn't concave (which would convince me for sure). I took it to a trusted friend, who was equally unsure of it's sex. I would post photos of Mike, but I don't know how to shrink them.. if anyone is curious I can e-mail photos to them.

Is there a way to sex Mike without using x-rays or more intrusive methods?

Thanks, guys!