The infraction was clear (one company clearly using a term trademarked by another) and I wanted to comply with the request. Unfortunately the Amazon Store module doesn't provide anything like a "black list" to suppress listing an item.
For example it would have been way cool to take the ASIN, put it into a "suppress these items" list, and those items would never appear on the site. There could be many reasons to do this - not just to satisfy trademark infringement requests from lawyers. What if you don't like a particular product?
Fortunately there's a relatively simple way to do this using a different module. Namely, Path Redirect. Install it and add a redirect for the relevant amazon_item page. In my case the path to redirect is: amazon_store/item/B002OFWQ24.