Here is the response I got back from OPPO. Not a big surprise.
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Unfortunately we do not have any universal remote codes for our DVD products. Unless your remote control has learning functionality, or can be programmed using a PC, you will have to use the provided remote control. We are also unaware of any similar manufacturer codes which will work for our DVD units.

Some users have been able to use the remote code "1525" and "1224" for their remotes with success. This has not been confirmed by OPPO Digital, Inc.
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I don't know if the remote that came with the Samsung is a "JP1" or not and don't know how to find out. I'm not up for trying to re-program it anyway. It takes a three digit code so I'm left with going through and trying them until I either find one that works or get tired of pressing numbers.

I have a Harmony 659 (now Logitech) in the main room and may get one for the bedroom if I get tired of having two remotes in there... or maybe I'll get a new model Harmony for the den and move the 659 to the bedroom.

Thanks for the responses to my question!!