"Proofs" were listed for many of these at one point, but just like the myriad of "proofs" floating around on ebay (oversized proofs, two-card panel proofs, etc), they are not permitted to be listed here as they were simply hand cut (or machine cut) from the uncut sheets. However, since the uncut sheets were not the method of distribution, but the finished discs were, only the finished discs are allowed to be listed here.
As for the rarity of these, and others, I hope that's the case, because I have one (not this brand or year, and even have my scans removed from the site when the set was removed by Admin), but I have no idea on the scarcity or value of the square ones cut from sheets.
-- 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).