After a few more years, and 160 document cards from the 1993 set, I have also started tracking the 1994 cards and adding them to TCDB.com. I think I understand these a little better. Nothing was produced in advance. While I still haven't found any marketing material, the verbiage for these porcelain sets was something to the effect of "limited to 1000", but they were effectively produced on-demand. So while a card is "limited to 1000" only 12 may have ever been produced and sold. After all, the cards are basically just porcelain blanks with decals affixed to them, they aren't actually produced as specific cards from the kiln. Finding a stack of the unused decals would be fun!
So while there could be at most 1000 or 5000 copies of any given card, that is a production limit, not a print run. It also helps explain the weird assortment of players.
I'm up to about 33 cards for the 1994 set, and the team distribution is a lot like 1993. In 1993 someone ordered lots of Braves and Rockies. In 1994, someone ordered a lot of Indians and Giants. So while I have seen a copy of the 1993 Dave Henderson (years and years ago and missed it) and I own a 1993 Roberto Kelly, the chances of finding a Meulens are likely slim to none unless someone happened to just order a bunch of Yankees and they eventually find their way to the market.