Huzayl (may Allah have mercy on him) said: I saw Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) when a man came to him with a sealed purse and said: "I have announced it, but no one has recognised it." Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: "Make use of it."
Imam al-Shafi'i (may Allah have mercy on him) said: This is what is established from the Sunnah of the Prophet (peace and blessings be upon him). And they narrated a hadith from Amir, from his father Abdullah (may Allah have mercy on him), that Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) bought a slave-girl; her owner went away, so he gave her price in charity and said: 'Allahumma hadha 'an rabbiha' (O Allah, this is on behalf of her owner); "If he disapproves, then it is mine and its price is upon me." Then he said: "This is how a found item is to be dealt with." They opposed the Sunnah regarding found items, having no proof with them; and they opposed the hadith of Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) which agrees with the Sunnah and which is established in their view; and they took this hadith as evidence while they themselves oppose it in the very matter it concerns.
The Shaykh (al-Bayhaqi) said: It has been narrated from Sayyiduna Ali (may Allah be pleased with him), as his own statement, something that agrees with the view of the Iraqis.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب اللقطة / 12061