Thank you for the CAA files link, @jesus2099 . I was not aware of that window into the archive.
On a related note, the CAA API lists URLs for the thumbnails, but the thumbnails are not present at those URLs.
I noticed that on 19 May 2017, the Cover Art Archive was having problems. The cover art in question was uploaded four days later.
Should I be filing a ticket against the CAA project for situations like this, rather than posting to this forum? Is that a better way of getting the attention of the right people when they are ready to deal with it?