In that post you suggested that out of a 6,500 vehicle total, the USMC was to get 1,100, the USAF and Navy 100, and the Army would get the balance. Army News
reported in March 2010 that it expected the service to receive 6,000 vehicles.
I need to update the specific page on Globalsecurity.org because we also have this
announcement from Oshkosh from February suggesting a total buy of 8,079 vehicles by that point (up a little less than 1,500 from the January total). This would easily allow for a USMC buy of 1,100 or more vehicles, depending on the requirements for the USAF and Navy (and those 450 vehicles for SOCOM, but I don't know if that's on this contract or not).
The contract limit I believe was 10,000 vehicles, so it could easily get up to that.