the inspection has been scheduled on Aug 12
the goods has been scheduled Aug 12 inspection*
the goods has been scheduled inspection on Aug 12
None are correct. The beginning of a sentence should always be capitalized.
#1. The inspection has been scheduled for August 12 - though I prefer August the 12th.
a. The inspection had been scheduled on August 12.
#2. The goods have been scheduled for an inspection on August 12.
#3. The goods have been scheduled for an August 12 inspection.