That's Emacs Lisp. It doesn't actually generate any of what's on the web page, but when it's open in an editor, it can be run to mark up each <td> cell with a comment containing a number corresponding to the color of the cell. So <td></td> becomes <td><!--3--></td>. The string of numbers is probably generated so that someone can open the source in Emacs and see at a glance what color each cell should be.
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RE: I expect random junk in comments in the HTML source of pages from time to time.
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RE: Another dumb scew story
It looks like a transport screw. They lock moving parts so they won't get damaged during shipping. Turntables used to have them. The removable plastic inserts around the head of an inkjet printer exist for similar reasons. The tag is warning you not to remove the screw from whatever hardware it was stuck in until after shipping.
Of course, that means that not only did they remove the screw before shipping, they sent you the evidence. I would make sure any moving parts get a thorough workout, especially components that look like they would fit in the box the screw came in.