Uh....George is freaking dead.

They killed Wax. They took Alice and were willing to hold her and use her as bait to lure Nick out onto the open. The suits will easily discover Nick and George's past friendship (even if they were only casual colleagues, though George did offer Nick the use of his summer home)....and they'll hold him indefinitely and try to lure Nick back again. Even if they don't find him, they will hold George forever. Nick must know this; they were going to do the same thing to Alice and they already killed Wax for simply knowing that Nick existed.

George is dead. Or he's kidnapped and locked away for life, which means his life and liberty are over. Nick cannot expose himself by telling his story to the press or he will eventually be tracked down in the Alps. And Alice (who is now his wife or partner) seems to have a character whose ethics would never allow George to die or be held involuntarily just to guard their secret. She'd never be okay with the knowledge that they left George out to dry.

Now, Sam Neil's character is dead, and Tobolowski's supervising agent believed Nick is dead and tells his guys to clean up the situation.

But the MOST IMPORTANT aspect of that cleanup is assuring that they find and remove an invisible dead body. Tobolowski's character would learn pretty quick that none was found, realize that Nick is still out there, and he'd then have no choice but to hold George hostage as leverage.

Unless maybe he wants to disavow that his department ever knew there's an invisible man? Possibly. But he still knows Nick's out there. Unsettling.