I know it's a long shot- actually have no idea where it could be but I figure it can't hurt to put it out there.
As the thread title states- it's a blue 1st run Champion Sidewinder. My name (Sally West) and number are on the inside. It was a gift after winning the Amateur points series in Colorado in 2007. The inner rim has a note stating something to the effect of: "Sara (I know my name is not Sara but the guy who gave it to me couldn't seem to figure that out even after several corrections)- Congratulations on your 2007 Colorado Thin Air Tour Championship"
Last I saw it was in Sisters last week but swear I had it with me when I came over for the Hope Open. Looked in my bag to throw it during the 1st round and it was gone.
Picture of similar disc attached- my disc had the same stamp.