LANHAM, Md. (CBSDC)- Someone who donated to the Goodwill retail store in Manassas recently could have been several thousand dollars richer had they kept a piece of artwork that turned out to be the authentic product of a late-19th century Italian artist.

But, as it stands, Goodwill Industries International will make at least $8,000 from auctioning off the Giovanni Torriglia painting, which was found by an employee as she sorted through items at the Virginia donation center, The Washington Post reports.

Bidding on shopgoodwill.com will end Wednesday.

D.C. consulting firm owner Amy Murphy Kuhnert, who estimated the painting’s worth at around $12,000, told the Post it was the first piece of valuable artwork she’s seen from a thrift store. She said she determined the value by researching what Torriglia’s work has sold for at other auctions.

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