Dr. Pepper Grill & Cooler Set ( Unused Condition)

This is a Dr. Pepper Cooler and matching Grill, never used, that I got out of storage unit. I also got a Coke Grill out of the same unit and it too had never been used before. What I would like to know is When and Why these were made? How many were made . I have looked around online and found lots of Grills that look like the Coke but I have never found anything with the Dr. Pepper logo like these. I sent an email to Dr. Pepper they ask me to contact the Dr. Pepper Museum so I did, they email me regularly but not about this Grill Set. I heard from someone else that only 40 were made but I don't know if that was true. I hope by posting here that someone will remember if Dr. Pepper ever had a game and one of the prizes might have been a matching Grill and Cooler set? They have been well taken care of and look like they have never been used. I would like to know when and why they were made? And any other information that you can give me about these items here. Thanks in advance.