I've gotten a few of these and each time I've filled out the Return form, Amazon's response has been "ok, we're refunding your card, no need to return the item".

Yes, as I mention in the article, that has happened to me to me a few times as well.

There may be something about the products being custom-made that causes this. I’ve had it happen with one that had a noticeable print defect (On Writing Well) but also to a few where I simply didn’t want a print-on-demand.