I don't know exactly what difference there is between "sold" and "marketed" but the wording specifically says "marketed" for whatever that's worth.
Here's the Guidance as it pertains to already regulated tobacco products: http://www.fda.gov/downloads/TobaccoProducts/GuidanceComplianceRegulatoryInformation/UCM416498.pdf
And here's some of the examples they give could serve as proof of 'marketing'. Not necessarily that a retail purchase was made.
dated copies of advertisements
dated catalog pages
dated promotional material
dated trade publications
dated bills of lading
dated freight bills
dated waybills
dated invoices
dated purchase orders
dated customer receipts
dated manufacturing documents
dated distributor or retailer inventory lists
any other document you believe demonstrates that the tobacco product was commercially marketed (other than exclusively in test markets) in the United States as of February 15, 2007
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