hi everybody,i have a problem-my family was here on b2(tourist) visa.now my relative's flight back is in 5 days and he seems to have lost his I94!What can i do?can i send him back and file for a new I94 myself or does he have to stay here until he gets a new I94?will it be a problem at the airport?if he goes back and i file the I94 from here,will there be a problem in him coming back?

thanks in advance,i'm sure someone here can help me!any help will be appreciated.