its not a scam!
i myself am the beneficiary of michael jacksons estate...and I am just waiting on the paperwork to come through, i have paid in advance for express service so any day now, woohoo!.
i know its genuine because, although we never met, i wrote a lovely letter to michael when i was 10 and got a lovely signed photo in return - for him to have gone to all the trouble of taking a photo of himself, having it developed (no digital cameras in those days) signing it and posting it to me, must have meant he thought i was special, so its understandable he remember me in his will really...
im sure only circumstances prevented us meeting in person - if he'd ever been in liverpool he would have popped round for a brew.
i daresay you once bought a belt he'd designed or something and he just wants to show his gratitude...you deserve it