Statistically speaking, when someone kills a person familiar to them, they bury them. Typically when someone is just "discarded" out in the open, there is a more likely chance that it was a random encounter.
The fact that Will has not been found after the intrinsic searching leads me to feel he was buried.
Considering the players involved in his "last seen", I'm even more inclined to think he was buried.
I don't know who is searching at this point, if anyone, but it may be time to revisit past search areas. Especially those areas that drew unexpected attention.
JMO