Stampede with white foam?

I thought I had all the foam inserts covered for Activision until I just received a batch of boxed games in the mail. I finally started getting to them and to my surprise, there was white foam in front of the Stampede circuit board. I thought I was pretty thorough in listing all games that had the foam, and I don't think this has been doctored at all. It's relatively difficult to remove the foam intact. Anyway, this version is the one that actually lists the "atari" copyright notice on the bottom, which I thought was the 2nd release. Anyone have any info on this?

Phil