Question about the HP 35s sleeve case

[ErikN]

Thank you for your thorough investigation!

Looks like I ruined mine then. I guess I will have to find another protective case.
Too bad that they don't ship the zippered ones with new calculators anymore. Those seemed great

Edit:
I took a toothpick and carefully separated the liner at the edge, and it would seem like there is a sheet of cardboard between the liner and the outer case. Or in my case, there was cardboard, now it's just a wet substance that looks like it used to be cardboard. It was probably glued in place at least to the liner. I should have just wiped the outside off with a cloth, but lesson learned (and money lost I guess).