Glenn Fricker
Very Metal &Very Bad News
t. I couldn't find any conspiracy theories having anything to do with serial numbers or anything, but in terms of the engine debris belonging to an entirely different kind of engine, I did find this rather interesting page which addresses the notion.
http://www.aerospaceweb.org/question/conspiracy/q0265.shtml
Does that explain things to your satisfaction?
Thanks for the link! Great info on that page!