In 2014, a day laborer sold a box of 58 rare coins—which he said he had found while clearing out the basement of a house in New Jersey—to a Philadelphia thrift shop for $6,000. Three years later, in 2017, when the thrift shop announced they were to auction the coins—valued at $2.5 million—Armstrong came forward to declare himself to be the rightful owner. He claimed that he had hidden the coins in his mother's old house to take them "off the books" in anticipation of the public offering of his firm. The thrift shop sued Armstrong, asking the court to declare the thrift shop as rightful owners while Armstrong counter-sued, also seeking ownership. In 2019 the US government found out about the coins and claimed them as part of the treasure hoard Armstrong had refused to hand over in 1999, and for which he had served seven years in jail for contempt. (In addition to rare coins, the treasure hoard—valued at $12.9 million—included 102 gold bars, 699 gold coins, and an ancient bust of Julius Caesar.)[24][25]

Armstrong was deposed and, according to Receiver Alan M. Cohen, Armstrong admitted hiding the coins. However, Armstrong's attorneys said in a court filing that Armstrong did not make this admission. The auction house now possesses the coins and the US government has filed suit to take possession. [24] [25]