From my own experience it’s been fine. My counselor submitted my school report and recommendation 2 weeks late, and I was still accepted EA to Boston College and Villanova. I know on University of North Carolina Chapel Hill’s website, it specifically says supporting documents may be submitted a few weeks after the deadline. I’m guessing other colleges are the same.
Here’s more info: http://talk.collegeconfidential.com/discussion/comment/19127554/#Comment_19127554