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A Lurker - what model is your kindle?
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other responders - as previously implied I know diddlysquat about MOBI and Kindles, but I have read enough here to know that there are plain ol' Mobidata MOBIs, and there are dual MOBI's - which contain a MOBI format and an AZW3 (KF8) format. It's not immediately apparent to me which of the two we're dealing with here.
If the OPs Kindle can read AZW3 (files), would he/she not be better off converting to that, then the Book Editor could be used to examine the AZW3's innards?
Apologies if I'm on the wrong side of the road. Stay safe everyone
BR