we don't know what backs they are talking about, but if its Piedmont one would imagine it may be a regional scarcity, but if its carolina brights no wonder they cant find any,,lol.
In polar bear it seems 'somewhat available' , or certainly other scarcities far supercede it,
https://www.crtsportscards.com/my-t2...ear-collection
although said polar bear collector does not have one!
story indicates it may not have been on a sheet for all of the print run, thats all I get out of it