Alex, all you can really do it wait, and then send the stubs off to VS if they have not appeared after a few weeks if they dont credit automatically.
AC - if the tier points count towards renewal then VS will honour this, you have the stubs as proof so if you mail them in recorded delivery then call CS/Premier, one of the staff there can manually credit you once they have seen proof that you took the flights. I've had them do this over the phone before.
Thanks,
Sarah