In my thrifting journey today, I picked up a cart for Rolling Thunder 3 and Streets of Rage 2. After getting both home, cleaning them, and opening up them to clean the pins, I noticed the Streets cart had a weird shape to the top of back half for the cart. I have included shots of this variant with this post.
At first, I thought the back half had been melted, but upon opening, I noticed a plastic piece juts out from that part of the cart as if it would fit into its complement on the front half (there is no corresponding shape on the front piece). This weird plastic shape is not present on any of my other Sega Genesis carts. I always clean all my games and open them up when I get them.
Has anyone seen this before?