Tryin to identify this cocoons and larva

I leave in Seattle, WA and while checking my Mason Bees nest I found that something else has nested there, anyone knows what this could be? Thanks! https://preview.redd.it/3j45ckc784e51.jpg?width=4032&format=pjpg&auto=webp&s=80ed64f81fa9f741642a7068120c9e3c6db7d3e4 ​ https://preview.redd.it/avb24r1884e51.jpg?width=4032&format=pjpg&auto=webp&s=4d98121fb2f2dd681d5533ec77e2c05d54e4ee6c ​ https://preview.redd.it/fp51687584e51.jpg?width=4032&format=pjpg&auto=webp&s=58ef7a3eb5ed77a269b7569c74d40b72219e28ac https://preview.redd.it/x216db9484e51.jpg?width=4032&format=pjpg&auto=webp&s=fd36b0f98f4c0da113e10f29b904aa36b665670e ​ https://preview.redd.it/vtovuue184e51.jpg?width=4032&format=pjpg&auto=webp&s=6c759d743d3caec947f6f7726fb8244a96ab0185 https://reddit.com/link/i10psf/video/g14jwp9e84e51/player submitted by /u/ppfs [link] [comments]

source https://www.reddit.com/r/Entomology/comments/i10psf/tryin_to_identify_this_cocoons_and_larva/