Rottenray has in post #528 a link to a site showing remains of a missile found at the crash scene(?):
http://pbs.twimg.com/media/BsxabpVIAAALK9c.jpg:large
He has the opinion that the picture shown has been photoshopped and gives a number of reasons for his standpoint.
I do not know whether the picture is photoshopped, but I am convinced that the missile shown is NOT a SA11. I have compared the missile shown with a very clear picture of a SA11 from the following link:
Buk missile system - Wikipedia, the free encyclopedia
Look at the fins for example - on the missile shown in the first link they are almost as high as the diameter of the missile itself. On the next link (showing a genuine SA11!) they are about half the size of the missile diameter.
And there are no external fasteners on a SA11, and although hard to judge, I should think that the first missile is much smaller that a SA11.
I also think that a missile falling from more that 10000 meters would show much more damage than can be seen on the picture.
Whether the missile shown is an anti-tank missile as suggested by TEEEj in post #564, I do not know.
I do think that the B777 was shot down, but with a missile not in any way connected with the remains shown in the first link.