Mistake with 2008/2009 First Time Homebuyers Credit

Seeking advice

On my 2008 taxes, I claimed the $7,500 first time homebuyers credit (loan) believing the house I purchased closed on 12/30/2008. Every year since then, I have been paying the required $500 repayment installments (12 out of 15 paid so far to date).

Going through some old documents today, I discovered that the closing date of the home purchase was actually 1/2/2009 instead of 12/30/2008 - meaning I should have been eligible for the 2009-2010 $8,000 "free and clear" credit! I don't know how I mixed up this date!

In any case, before I contact the IRS regarding the matter, is it even remotely possible to recoup this credit? What are your thoughts?