Large amounts of scholarly information are lost to the world due to conference proceedings being closed access, being deleted from websites, or never even being collated. But just how much is lost and how much is still available? I sourced a dataset of conference outputs listed as Nominated Research Outputs in the 2012 PBRF round. After data cleaning, I derived an anonymised dataset for which TEC granted permission to share online. I then crowdsourced help to search for proceedings from each conference and classified these as: free online; non-free online; available in physical form; or not apparently available. In this presentation I will provide an overview of my methodology, including tools used in data cleaning. I will then discuss my results and their relevance to PBRF auditing and the broader realm of scholarly communication - along with my blue sky solution to the problem of lost conference proceedings.