Your Disneyland 35th birthday ephemera collection is insane! I don't have any ephemera from the 35th birthday, but I'm pretty sure there was a small cardboard french fry boat/dish. You might want to look for that in addition to the napkin! I like your idea of getting a fake hamburger and fries to display in the box. Oh, and I'm still enjoying catching up with your past posts!
I need the french fry boat in my collection. I'm going to keep an eye out for that one.