Neither 'suelo's nor CK's version works for me, but they led me to another method. To determine the number of a post, click on the poster's name (thereby bringing up their profile), and then look at the browser window to find the post-number.

btw, I see that others repeated my typo in the "Re" line, suggesting that Res are unread. Shall we conclude that Res are unnecessary, perhaps because [ahem, TEd and F] Res ipsa loquitur?