My hat is lost!

 I left my Akubra hat in the marquee after the festivities on the Sunday night of the HCR.
The last time I saw the hat had A DBW beanie on it and was on a trestle on the southern side of the marquee (hill).
It had three hat pins on it, Husqvarna, 10 year AMTRA, Chev Bow Tie with Impala.
Help with finding out where it is now would be much appreciated.