I don't visit the forums very often and just discovered this post.
Initially made the same mistake of posting pics of both sides and quickly edited and posted a new photo with the TB89PY4 description removing the code.
I spent about 10 minutes going through all the discovery logs after viewing the image gallery and deleting the photos.
I did include a note to repost if they wished without revealing the TB code. Hopefully I won't get any angry messages from them.
Aside from paying closer attentions to the logs and asking the finder to edit or remove the photo, is there an easier way to delete the photos in the gallery with a few clicks?