It's right there in the reentrant!
Literally laughed out loud when I read this.
You'll never find it!!!! MWAHAHAHAHA
Oh, were we supposed to turn those orange and white flag thingies in once we got back from the Mystery-O section? We found a bunch but only took the one by the stream, figuring we'd give some other teams a chance to grab them. :)
Fun AR party trick: fill your pack with old O-flags, run up to the race director at the first T/A, dump them out of your pack, and exclaim "we got seven!"
OMG laughing at this prank and yes i would have a conniption as an RD if someone did this!!