And to add to that - if we are unsure of the quantities printed of the cards, we should not mark them as SPs just because we "think they might be". Topps announces that their intentional "VAR" cards are in fact short printed, hence the reason we mark them as such. The Donruss ones, if they are not announced as SPs, then we cannot, in good faith, list them that way - because they very well could be printed in the same quantities.
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 10/25/2023). I have added a large portion of my inventory to the site, and currently have trading turned off (details are in my profile). I have (finally) unearthed my 2 very large boxes of Star Company minor league sets and they are available (email for details).