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It means that Wireshark hasn't the information available to translate these numbers into something meaningful.

If you have this in an XML file, you could add them to the dictionary.xml, as stated, to aid in their dissection.

If you don't have them you may want to try the development version of Wireshark (3.5.0) to see if these are included in the mean time.

Not sure what you mean by 'raw frames', but maybe you could explain that in a comment.