There are many spare / repair parts for vintage calculators being sold on TAS, such as battery doors / latches, logic boards, rubber feet, printer idler gears, etc. But I can't understand why anyone would ever need one of these. I've never seen one of these break or be missing from a card reader. Perhaps if the seller had replaced the rubber / plastic it might have some value, but not as it is being sold. Anyways, just an idle observation.
Note: Normally at this time of day on a weekend I'd be out and about instead of posting unimportant items on this forum, however, I had hernia surgery just a week ago, and am condemned to sitting bored at home for weeks while I heal. Thank God for the internet and cable TV.