According to NC instructions - http://www.dornc.com/downloads/D401.pdf
Who is required to file a North Carolina individual income tax return?
Every nonresident who received income for the taxable year from North Carolina sources that was attributable to the ownership of any interest in real or tangible personal property in North Carolina or derived from a business, trade, profession, or occupation carried on in North Carolina, or is derived from gambling activities in North Carolina
and whose total income from all sources both inside and outside of North Carolina equals or exceeds the amount for his filing status shown in Chart A or B below.
See threshold amounts on the page 4.
Please note that filing requirements are based on the total income - not taxable income, and not income reduced by any deductions or by the amount which was deferred for federal income tax purposes.
Please also take in consideration that NC DOR received an information about the sale price, but has no any information about the basis and will consider the total proceeds as your taxable income unless you file a tax return.
-- you most likely are required to file a tax return (assuming the sale price is above the threshold)
-- by filing the tax return - you will inform the NC DOR that you do not have any tax liability
-- if you do not file a tax return - the statute of limitation will not applied, but if you do file the tax return - NC DOR has generally only three years to assess any additional taxes.
Let me know if you need any help.