Lost rare vintage 1950s Mickey Mantle baseball card in pristine condition near the fountain bench at a local park in Merced.

I lost a rare vintage baseball card from the 1950s features Mickey Mantle after visiting a local park in Merced. I last remember having it while sitting on a bench near the fountain. It’s in pristine condition and in a protective case, making it even more valuable. I've searched everywhere, and I’m hoping someone might have found it.