Musannaf Ibn Abi Shayba 13:1703

Abu Bakr narrated to us, he said: Hatim ibn Wardan narrated to us, from Ayyub, from ‘Ata’, and Abu Khalid al-Ahmar, from Yahya ibn Sa‘id, from Mu‘awiyah ibn ‘Abd Allah ibn Badr, from his father, who said: I found eighty dinars during the era of ‘Umar ibn al-Khattab. I brought them to ‘Umar, and he said: "Announce them for a year." I said: "And if they are not claimed?" He said: "Then enjoy them."