your literrly asking for verry specific information that is IMPOSSIBLE to get all we know about thsoe demos is that they where used in kiosks in eu countries was nintednogs in an kiosk in polland for example? maybe but no way to find out.
We put information in that is confirmed. If we don't know, or it can't be proven, then we leave that out. We can always add information later, and it is best to not presume information in the case we are wrong.
Real world example:
Mario Tennis Open demo being
sold in Spain has a cart item number of LNZ-CTR-AGAP-EUR and a back number of AGAP52041B
https://www.ebay.co.uk/itm/317211178810Mario Tennis Open demo being
sold in England has a cart item number of LNZ-CTR-AGAP-EUR and a back number of AGAP52041B (the same)
https://www.ebay.co.uk/itm/266708249037Can we
presume that the cart sold in England is from England and the cart sold in Spain is from Spain? Yes
Can we
prove that? No
Can we
presume that all carts in EU have the same 2 numbers? Yes
Can we
prove that carts from other countries in EU have the same 2 numbers? No
So we put the information that we know for sure. We know this cart with these 2 numbers are from Europe.
The item number is the number from the cart label like usual. Put the back number in description.