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LequteMan
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City officials in La Coruna, Spain have advertised on the lost-and-found section of the city website for the owner of a lottery ticket to come forward.
The ticket which is more than a year old hit the jackpot, earning 4.7m-euro (£4m; $6.3m) for its owner.
The ticket was bought ahead of the 30 June 2012 draw and was found in a lottery shop.
"I'll be the first Spanish mayor who's searching for a millionaire not to ask for money but to give it," said La Coruna's Mayor Carlos Negreira.
The authorities are not revealing exactly when or where in the north-western Spanish city it was bought, so they can test the claims of people coming forward.
The purchaser might know the numbers chosen, but might also have requested numbers to be selected randomly by the lottery machine.
"If no-one comes forward who meets the conditions in the next two years, the ticket will be handed to the person who found it," Mayor Negreira said in a statement.
La Coruna is required by law to try to find the holder of the winning ticket.