Installing my second deep this morning, I saw a larvae in a thin silky cocoon in the inside ledge of my top cover. Thinking it was inert, I scraped it out but left it intact on the cinder blocks the hive sits on. (I was planning to return later and take a picture for reference). When I returned the cocoon was empty, and the larvae was gone.
Can't say for sure that it was a waxmoth larvae. It was white, and about 3/4of an inch long, but to be honest, when it comes to larvae, they pretty much all look the same to me.
This is the first I've seen of this.