The discovery process could get interesting as well. All of your records would beopen to discovery (still have your seed bag tags from x number of years), as well as price discovery where you did sell grain and where you Could have sold grain. Add into that proof of yield numbers (scale tickets) and anything else they want to look into. Did you feed a percentage of your grain to livestock? Prove you didn't feed all of theirs. 

Just remember, they now have the financial backing of the Chinese Government to hire lawyers and do nothing more than harass you until you give up.