[texasnightowl]

OK, finished downloading in K4PC and I do have an answer...

the 3 books shown in K4PC that I did not have accounted for are:

2 user's guides...a "Kindle User's Guide" and a "Kindle User's Guide 3rd Edition"

and the other is a book that I did purchase at one time, back in 2009. But a few years back when I was reconciling my purchases against what I had in Calibre, this book was no longer available in My Content Library. I made notes for myself in Calibre and I had it in my order history, but it just was not showing in My Content Library.

This was in 2022 that it was not showing. I did an organization thing where I went through my content library and put everything into collections by the year of purchase and did the same in Calibre (well, I added tags). That is how I figured out I had this book in Calibre but not in my content page on Amazon.

But...K4PC just downloaded it.

And now I just rechecked and it IS back in my content library now. So sometime between 2009 and 2022, it disappeared. And sometime between 2022 and 2025, it is back.

edit: also, if you click the title for the book to go to the product page, it doesn't exist...just one of the sorry pages with dogs of amazon.

Mystery solved at least...