The money orders range in date from Aug. 1st to Sept. 23rd and are from Western Union, Money Gram, and Memo Financial Services.
Does anyone else find it odd that a person would hold on to $11,000 worth of somewhat old money orders?
It is odd and perhaps these money orders were stolen or obtained illegitimately.
If you're not 100% confident with the trade then don't go along and finalize it, simply opt out or tell him to instead pay you all by cash. Since you still have the goods on hand, there should not be an issue with this.