There was a thread made about it. https://www.skial.com/threads/scam-report-sarcasm-tf2-admin.57933/ But I don't think you will be able to get your items back. Still doesn't hurt to contact valve about it by opening a ticket.
But here's the article that you will need. https://support.steampowered.com/kb_article.php?ref=8912-WEYU-8454
Well I did another search, and it seems as though steam will not be able to return your item. :/ https://support.steampowered.com/kb_article.php?ref=9958-MJDG-3003#noreturn