Documentation for the IRS for First-Time Homebuyer Credit?

Fiance and I closed on our house last week. I am in the process of preparing the following IRS forms: 1. 5405- First-Time Homebuyer Credit 2. 1040X- Amended U.S. Individual Income Tax Return As nothing else has changed in my return for 2008, is there anything else I should include when I send this to the IRS?... show more Fiance and I closed on our house last week. I am in the process of preparing the following IRS forms:
1. 5405- First-Time Homebuyer Credit
2. 1040X- Amended U.S. Individual Income Tax Return

As nothing else has changed in my return for 2008, is there anything else I should include when I send this to the IRS? Might they need some proof that we really bought the home? How do they know?
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