EDIT: Solved! See comments on Facebook (https://www.facebook.com/mary.a.mohanraj/posts/10160558926189616)
I am feeling REALLY dense here. These seem to be standard molds for chocolate bars, and these seem to be standard wrappers for chocolate bars — all the Amazon descriptions seem to indicate that. But I cannot see how these wrappers can possibly be large enough to fit these molds. They don’t even meet at the edges when I fold them over. GAH. What am I doing wrong?