The coins were minted to celebrate Her Royal Highness Princess Maha Chakri Sirindhorn’s 60th birthday. Police found no damage to the cabinet that contained the coins at the Mint, in Pathum Thani. “We have questioned 20 suspects, all of them working at the Mint. But we paid particular attention to three officials, one of them holding the key to the locked cabinet,” Pol Lt Colonel Suwit Pakamhaeng, deputy inspector at Klong Luang Police Station, said yesterday.