It's not too late. I believe that you have at least another couple weeks to submit it; most likely longer. You'll have to call the Financial Aid office for more info on that.
Have you been able to access AGORA? (
www.bc.edu/agora)
According to AGORA, you'll need to send in:
*CSS Profile, 2008 (Access through collegeboard.com)
*Student IRS 1040 Tax Return, 2006
Custodial IRS 1040 Tax Return, 2006
*Custodial W-2 Form, 2006
*Student Incoming Undergraduate Validation Form, 2008 (Found online or in acceptance folder. You'll need to pay the tuition deposit.)
If you have any more questions, you really should contact the FinAid office; they're very helpful.
Good luck!