So sorry you did all that work and then lost it.
I haven't read all the answers so maybe this has been mentioned already. I too was going to use crayons for a quilt I was making. I had been told by others if I pressed it before washing, it would be fine. Fortunately I tested it first. After washing my test sample, the crayon was very faint. I believe with the changes to make crayons washable in the last few years, they just don't work for quilts. The option is to use fabric crayons but the down side is they are permanent so if you accidentally get any on your clothes or anything else, you have to live with it.