Those bytes occur only on records that are spanned (i.e. have no start/end points for periodical/section/article nodes) which means they probably contain information about the spanning node.
I'm not overly keen to decode them, since as I said, they only seem to occur in kindlegen 1.1 output. But all the data you need to decode them is in tbs_indexing.txt so knock yourself out if you feel like it.
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