After you file

I downloaded Turbotax and filled out a return for my son.  I filed the return and he received his refund.  However, I can not find a copy of that return saved on my desktop PC.  I filed and saved my own return and another son's return.  I can find both of them, but cannot find one for michael patrick worden, or 2108 worden mp, or other variations.  Can I retrieve a copy, or does he need to, even though he did not prepare it?