IDOC received date problems

<p>I was supposed to send in my IDOC by March 1. I sent it on February 25 with priority mailing and delivery confirmation. On my delivery confirmation, it said that the packaged was delivered to collegeboard on February 28 in the morning, yet on the IDOC website it said they received it on March 2. Would this make any difference at all? If it does, what do I do?</p>