Had to dig under my foundation. What should I put in the whole when they fill it in?

I'm a big fan of concealing doll heads behind drywall. The local hobby shop used to sell half-heads (just the face and neck, including eyes), so that was my go-to.

It was also a hard to fix drywall job, so it looks a little janky. It's almost guaranteed that the next owner rips out that section and finds her.