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: "A found item is not lawful (for oneself). Whoever picks up something should announce it. Then if its owner comes, he should return it to him; and if he does not come, he should give it in charity. Then when the owner comes, he should give him the choice between being content with the reward (of the charity) or taking what is his (its equivalent)."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Ziyad bin Sa'd except al-Samti, and no one narrated it from Sumayy except Ziyad bin Sa'd."
Hadith Referenceالمعجم الأوسط / باب الألف / 2208
Hadith Gradingمحدثین:إسناده ضعيف جدًّا، فيه يوسف بن خالد السمتي كذاب
Hadith Takhrij«قال الهيثمي: فيه يوسف بن خالد السمتي وهو كذاب «مجمع الزوائد ومنبع الفوائد، ج 4، ص 168»» «أخرجه الدارقطني فى «سننه» برقم: 4389، والطحاوي فى «شرح مشكل الآثار» (12/128) [دون رقم في الترقيم المختار]، والطبراني فى «الصغير» برقم: 72»