２００２年我转换学生身份时，直接收到F1 approval notice.

I did not get any Receipt Notice from USCIS. but until 2008 when filing 485, I found the starting date was wrong: it should be 10/23/2002 not 10/23/2001.But the starting date on F2 approval notice was correct(10/23/2002).

I am worrying that I will get RFE about that. If USCIS asks the Receipt Notice of F1 to approve that, what should i do as I did not get any Receipt Notice at all!

1. can i ask USCIS to correct that F1 approval notice?
２。 what document can i submit to prove that starting date is incorrect?

Thanks