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All I'm saying is when you import your options are either add book as normally or don't since you already have it in the library. Add books is not the appropriate place for deleting old books.
And match books is one way out of several to TELL calibre which books are the same, since the problem is calibre doesn't know.
I have suggested one way which works with my workflow. If you don't want to do so, then you can still do as you just did, but it might require work.
Also, if I send the book back to the same filename (using custom column "#origfilename") the book is still in collections, but it might be due to filename or maybe it's just having the same ASIN. I haven't tested.
If you untick the book, the book will not be added. If you leave it ticked, a second record will be added. It's pretty straightforward.
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