When track cyclist Laura Trott won the final of the women's team pursuit she was excited that a red post box would be painted gold in her home town.
But the 20-year-old was dismayed as she discovered Royal Mail had repainted a box in the wrong location.
She initially wrote on Twitter: "when my postbox is painted gold tweet me your pics with it :-) x".
Great Britain's (left to right) Dani King, Laura Trott and Joanna Rowsell celebrate with their gold medals after winning the Women's Team Pursuit Final at the Velodrome
But after discovering a box was painted gold in Harlow, Essex, rather than Cheshunt, Hertfordshire, she added: "So people i need you to tweet @PostOffice for me.. my postbox is going in harlow which isnt in my hometown Cheshunt is where it should be!!"
Tim Cowen of Royal Mail said the mistake was made because her home town is listed as Harlow on the Team GB website.
"We tweeted her straight back to say we'll be delighted to do one in Cheshunt as well."
Mr Cowen said the company would paint a box near where she went to primary school, but it could be delayed until tomorrow due to Britain's run of gold medals.
"We are running a little short on gold paint, which is testament to Team GB's success. We'll be getting more supplies tomorrow," he added.
Royal Mail has pledged to transform one post box from red to gold in the home town of every British Olympic champion during the Games.
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The honour recognises the achievements of heptathlete Jessica Ennis, runner Mo Farah, and rowers Alex Gregory, Pete Reed, Tom James, Andrew Triggs Hodge, Katherine Copeland and Sophie Hosking - and is the first time Royal Mail has issued stamps on a Sunday.
King, Trott and Rowsell on course to victory
Royal Mail produced the stamps, celebrating British victories in the women's heptathlon, the men's 10,000 metres, the rowing men's four and women's lightweight double sculls, within 24 hours.
Stamps were also released commemorating the gold medal for Dani King, Joanna Rowsell and Trott in the team pursuit.
Long jump winner Greg Rutherford, who won a surprise gold with a 8.31-metre effort, was also recognised.
A fleet of 90 Royal Mail vehicles delivered the stamps to more than 500 post offices.