Unless something crazy happens and I receive the FBI record back in the next few days, I will be sending my application off without it as well. I sent mine of June 1st, so don't expect it back until mid-August.
I'm just going to write a brief note to include with my post office receipt and tracking info showing that the fingerprint card was received at the FBI on June 3rd and will be forwarded to the appropriate place upon receipt of the results. they don't use it in Missisauga, so as long as you include *something* that says that the FBI thing is in progress, you should be fine.