For what it may be worth, when I was playing with this issue and EBOK and PDOC as cdetypes, I placed 8 books on my PW4 in pairs. 4 books had the cdetype in the EXTH header set to EBOK while 4 used PDOC as the cdetype (this was done using a hex editor to locate and edit the string). The 4 books with EBOK disappeared, the 4 books with PDOC remained when a WiFi connection to Amazon was done.
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