Does anybody know how to tell the difference between an RU-503 and RU-504 if they are missing the back cover that has the model # on it. We have one that is brand new in the 2 seperate boxes but we are missing the back cover which is the only place I have seen the model # on them before. Any help with how to identify the one we have would be appreciated.
RU-503 and RU-504 for C6500
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