House Improvements/Basis/Tax

Since I bought my house 12 years ago, I have added about $20,000 in
permanent improvements which count toward the cost basis.  I am about
to sell it for a $60,000 profit.  Also since 12 years ago, the tax
exemption on capital gains on a house sale has risen to $500,000 for
married couples.
Do I have any reason to continue to track my house basis?
Will any of it come up for any reason anymore?
Can I just throw all my receipts and records of the improvments away?
--Niel
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