If the US government wants it, the US government gets it.
Gemalto is almost assuredly in self-defense mode and the government obviously will call Snowden the bad guy, once again, whilst the security apologists explain that having no privacy is a good thing for all of us.
The attack was allegedly about five years ago. There is no company that could effectively investigate an incident that old, particularly in the small number of days Gemalto had before they started issuing press releases saying everything was fine.