@Cranman I'm homeless and have posted on other sites about this. Wondering, like you I found out about 151 on Saturday 22nd but yet to receive letter. Homeless in hotel was told could of been sent back not sure.
I claimed my 2 nephew's like I have before and with reading bup on what other people have sent in trying to get my paperwork in order now.
I have hotel receipt for entire year of 2019 here. Nephew's Birth certificate and mine. Socials. My W-2 and printed out every paycheck stub from 2019. My mom has custody of my nephew's and does traditional homeschool but that's in her name.
I don't know if there would be any oth documents I would need do you. Called IRS agent not helpful said could not see letter. Referred me to Tax Advacate
