Could you be more specific about the "request in writing." Should it be made in the form of a prayer, such as "Please give me...." or more like a conscious intention such as "...by this time next year I intend to have/be/do..."?? Do you sign it, seal the envelope, not open it for a certain amount of time, stupid questions, I know but I'm curious because I've never heard of this and I, too am a bit skeptical.
I'll let you know if I have to eat crow as well!