The Legend of Zelda 1988 PROTOTYPE/SAMP LE? Puzzle CARDS Set Unreleased

This is 1 of only 4 sets of these prototype cards I know existing. The last ones I had sold on auction for more than this. I bought these from a card collector in the UK who told me that these were the only 4 sets made. what i can surmise is that these would have been part of a set of 9 cards that extended the artwork seen in cards 2 and 5. a "U" shape of cards would have surrounded 2 and 5, in other words. due to their original location, i would suppose that this could have been for a potential UK piece of merchandise/mfg. these are very hard to identify so i am presenting all the information i have but please ask amy questions if you bear concerns.