Holy smokes! I have a book that has the Buy Box at Amazon.ca. First time in over 25 years of selling there. Mine is the only copy (take THAT Thriftbooks!), but stillā¦Iāll take the win.
Edited to add, I went to look this book up in my database and it is no longer there 
I do have the book in front of me, but not available anywhere else than Amazon. Maybe that is part of the secret of the success. 
Hey, congratulations! Thatās some good feedback that Amazon trusts you. I know we do!
Found another one today, Iām on FIRE!! And on this one, I am not the only listing (they have one feedback of one star, so low bar and allā¦)
I donāt know about them trusting me, there is still a banner that says my account is at risk of deactivation 
Congrats - you will likely see a lot more of them as Amazon changed the algorithm for the used book buy box several days ago.
The available evidence over in the NSFE, here in the SAS, and in related discussion venues seems to suggest that Amazon bollixed the implementation of the 2025 INFORM Act Verification process as badly as it did during the first roll-out (aka the āGreat Apr.`23 SIV Snafuā).
It also suggests that a systemic fix is proving difficult to effect, in turn reducing the hapless 1P/3P Seller to depend upon a case-by-case resolution.
Hardly either an elegant or efficient solution, of course, but increasingly par for the course.
@randi you seem to be correct. I have lots of buy boxes now on the Amazon Canadian site, so far itās only on ones where there is no competition. So I donāt feel as accomplished about it as I did. 