Attached is a picture of an Activision "stamp sheet" that I acquired from a former Activision employee. The sheet has an adhesive on the back, and each gamebox image has a perforation around it, so that you can remove each one. Every game is identified with "GS" and then two unique numbers. The sheet instructs you to choose either Megamania or Pitfall, and then one from the remaining 15 games. I thought the sheet might be from the Columbia House Video Game Club, but I don't believe the club sold Activision games. The employee doesn't recall anything about it, and I can't find any information online.
Anyone have any ideas what this sheet was for? Thanks.