In April 2016 I sent originals of several documents (including my newborn's vaccination card) to the IRS when applying for an ITIN. The IRS claims to have sent them back to me, but they have not arrived (as of September) and the IRS cannot prove they sent them. I have not been able to resolve the issue through their customer service phone line, form 14692, or my local TAS.
Who can I contact for help recovering my documents? Would my congressman be able to assist?