This story is getting a lot of press. They think the message was intended for RAF Bomber Command, because the addressee code was "XO2", but they don't yet know the conents.
BTW, has anybody ever heard of RAF bombers carrying pigeons to return to England if the bomber was shot down. I've never read that and I've been reading WWII histories all my life. Can a pigeon even survive being tossed out of a 150 mph plane? Is it supposed to struggle out of the crushed and burning wreckage on the ground and them return home with the sad news? Which crewman had the job of releasing the pigeon before saving himself? Color me skeptical.
Unfortunately, this very story is making a Google search about the history problematic. Searching for WWII carrier pigeons and bombers is hitting on tons of news stories to wade through.