It would be about the purchase of the home you sold, to figure out if you have any taxable gain on the sale. The IRS doesn't require any information when you first purchase a home, it's only when you sell it that they care.
See this answer from TurboTax PatriciaV for information about the sale of your personal residence, because if you qualify to exclude the entire gain on the sale, and you didn't receive a 1099-S reporting the sale to the IRS, then you don't need to report the sale at all.
https://ttlc.intuit.com/replies/4995158
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