Sat, 1891 beat me to it with that link.  To bolster it, here's 5 crop years comparing the final weekly inspections report number to the export total number from the Census Burea used in WASDE.  Your supposedly 79mb shortfall fits perfectly.  (1.771/1.85= 95.7%.)

                       Weekly       Jan. WASDE           

9/2/2014      1,840,000       1,917,000     96%

9/3/2013        695,400         731,000       95.1%

8/27/2012     1,489,231      1,543,000     96.5% 

8/29/2011     1,766,532      1,835,000     96.2%

8/30/2010     1,855,994      1,980,000     93.8%