UERs do not show up in the ERR/COR/VAR area because there were no second versions of these cards.
Also, there is a movement afoot to start putting the lesser "errors" in the comments, rather than clogging up the checklists with this largely useless trivial information (really, the card company made a slight grammatical error 100 years ago - are you sure that wasn't proper at the time, but whatever).
I will ask this again, since no one has given me an actual answer yet:
What purpose do UERs actually have in the hobby?
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 3/4/2024). I have added a large portion of my inventory to the site, and currently have trading turned on (details are in my profile).