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National Lottery players are being urged to double-check their tickets as a prize worth £77,702 has still gone unclaimed in South Norfolk.
The winning ticket was bought in South Norfolk on Saturday 31 December 2011.
Five numbers and the bonus ball were matched in the Lotto draw.
A National Lottery spokesperson said ''We're desperate to find this mystery ticket-holder and unite them with their winnings - this amazing prize could really make a huge difference to somebody's life. We're urging everyone to check their old tickets again or look anywhere a missing ticket could be hiding''.
The winning numbers on that date were 7, 11, 37, 38, 42 and 44 and the bonus ball was 2.
The ticket-holder has until 5:30 pm on Thursday 28 June 2012 to claim their prize.