And IIRC, he's also the investigating juge for Ollie's disappearance (French system not the same as the English one, and Larence explained it to the Hughes in ep 1).
We haven't seen Alain in anything later than 2009, have we? So we don't know if he's still alive. If the medal is his, then Sylvie might have information. But if she's known things all along (and he is dead) why not just come forward? Perhaps it's not his?