If you are in a green card status now, i suggest that you contact Dept of Labor in your state and claim for all the salary listed on LCA during your H1B status. Nothing to loose here. It is your right to get paid while in H1B, regardless of they can give you job or not. Your case has nothing to do with morality. If i was in your position i would just go to the Labor Dept and drop a one page description with what happened along with the H1B papers and his letters.

If you are on other status like F1, do not bother as you are standing on a weaker platform.

Sid