I can't imagine them being done individually.
There being one out there with another card showing is a solid indication that they were done in sheets.
Aside from stuff like books where a bunch of pages that end up together are on a sheet, very little gets done individually. Most of that is very short run stuff that's not efficiently done on a larger press. For example a few hundred laser warning signs were done on the press that did stuff around 8 1/2 x 11, it wasn't worth doing them in a sheets of 4 on the 25-26" press.
The guys who know T3s better would be better able to get close to a potential sheet size by groups of related rarity or commonness. All of course affected by popularity.
Steve B
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