When I arrived that morning I found this bottle of Champagne on it.
There was no message with it so I asked colleagues if they had seen who had left it there? I was told a man with grey hair and glasses had left it for me (which ruled in 90% of male delegates).
I thought that I may have won it in a raffle but have since found out it was a thank you gift from someone who I had helped out when he got himself in a little bit of bother a while ago. It was not needed but a nice gesture.