That sucks. Hope you find it, not impossible it will still turn up?
In 2003 I fell asleep at Glastonbury lying somewhere towards the back of the crowd of the Pyramid Stage during Jools Holland, and when I woke up I went off to the New Bands Tent but realised when I got there that I’d lost my weed in the little neck-chain thing the guide had came in. I optimistically ran back to the Pyramid field and incredibly somehow found it again (actually somebody had picked it up but saw me looking for it and gave it back). Hope you have similar luck.