I could be wrong about all this but are the 777 fans not about the same diameter as a 737 fuselage?!
Yet here we have a pic of two (possibly different) intake lips including a guy holding one up with ONE HAND, No matter how strong he is I have trouble believing that these are from a 777.
Imagine a 737 cabin layout in one of the 'crash site' intakes in this post, just look:
Now, realize that the guy next to the 777 in this pic is 6'5" (195.58cm) tall (according to the source)
I don't doubt they're nacelle lips from a crashed aircraft laying in a field which exhibit shrapnel damage but beyond that I remain to be convinced. Don't loose sight of the fact MAS17 isn't the first Jet Transport to be shot down in the region.