No idea.. Kindle shows ALL books on home screen and Sony T1 only shows the last three added ones, so I can imagine one confused (and not very curious/adventurous) Amazoner thinking that ...before he's went and clicked the 'Books' button...
...but as you say it "can't be found" I have to presume a file search was done on the flash drive or something..? -- None of the 'four' books is a duplicate (so would maybe overwrite, thus adding without adding) ?
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