It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) was asked about a found item (luqatah), and he (peace and blessings be upon him) said: "It is to be announced; it is not to be hidden or concealed. Then if its owner comes (give it to him); otherwise it is the wealth of Allah, which He gives to whomever He wills." This hadith is sahih (authentic) on the condition of Muslim, and the two Shaykhs (Bukhari and Muslim) did not record it.