I think, if I'm remembering correctly, the first prop I ever made was in 1997 and was technically a paper prop. This was also before I even knew "prop making" was a thing.
My 6th grade class was putting on a play of Charlie and the Chocolate Factory, which seemed to be more based on the Gene Wilder version, after reading the book a few years later.
Anyway, even though the teacher had cast me as Mr. Salt, I was getting irritated by the incompetence of the "stage crew", and took it upon myself to design a Willy Wonka bar wrapper, and wrap it around a Hershey bar. It looked pretty legit for something a 6th grader made with printer paper and some colored pencils.
Oh and I also drew up the design for Wonkatania, but wasn't allowed to actually make it because I was "taking work away from the stage crew". Pft.