My housemate alyssa told me about a super easy way to get it official that i live in boulder. Instead of going through the post office or showing a utility bill, i can just get a state liscence. The dmv has more relaxed standards apparently so i just need mail addressed to me that has gone through the post. So today i bought a january unlimited bus pass and am working my way to the dmv.
A library card will be mine soon!