over Britain, so most notes were disposed of and not recovered until the 1950s. Today some of the finest counterfeit banknotes are called Superdollars because of their high quality, and likeness to the real US dollar. The sources of such supernotes are disputed, with North Korea being vocally accused by US authorities. The amount of counterfeit United States currency is estimated to be less than $3 per $10,000, with less than $3 per $100,000 being difficult to detect. There has been a rapid growth in the counterfeiting of euro banknotes and coins since the launch of the currency in 2002. In 2003, 551,287 fake euro notes and 26,191 bogus euro coins were removed from EU circulation. In 2004, French police seized fake €10 and €20 notes worth a total of around €1.8 million from two laboratories and estimated that 145,000 notes had already entered circulation. In the early years of the 21st century, the United States Secret Service has noted a substantial reduction in the quantity of forged U.S. currency, as counterfeiters turn their attention towards the euro. As a result of their rarity, gold and silver certificates have sometimes been erroneously flagged as counterfeits in the United States when they have, in fact, been genuine. Due to the fact that these banknotes carry significant numismatic value and are sought after by collectors, counterfeit examples have surfaced on eBay via unscrupulous sellers. A batch of counterfeit A$50 and A$100 notes was released into the Australian city of Melbourne in July 2013. As of July 12, 2013, 40 reports had been made between the northern suburbs of Heidelberg and Epping. Police spokespersons explained to the public in media reports that the currency notes were printed on paper (Australia introduced polymer banknotes in 1988) and could be easily detected by scrunching up the note or tearing it. Additionally, the clear window within the notes was also an easy way to identify fake versions, as the "window appears to have been cut out with two clear plastic pieces stuck together with stars placed in the middle to replicate the Southern Cross". Police also revealed that fake notes had been seized in June 2013 in Melbourne's eastern and western suburbs. According to the Australian RBA figures, during 2014–15, the number of counterfeit $50 currency detected in circulation has more than doubled from the previous year, and more than 33,000 fake notes were removed from