Or has found that which was lost, and lies concerning it, and swears falsely; in any of all these that a man does, sinning therein:
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Augustine of Hippo
AD 430
Shall we therefore say that when it is written that whoever finds another man’s property of any kind that has been lost, should return it to him who has lost it, doesn’t pertain to us? Do not many other like things pertain whereby people learn to live piously and uprightly? Isn’t especially the Decalogue itself, which is contained in those two tables of stone, apart from the carnal observance of the sabbath, which signifies spiritual sanctification and rest? Against Two Letters of the Pelagians
Lost. We acquire no title to the thing by finding it. The Roman law, as well as divines, condemn those who appropriate the thing found to their own use, as guilty of theft, whether they knew to whom it belonged or not; and Plato greatly commends the law of Solon, "Take not what thou didst not put down "a rule which the Dyrbeans and the people of Biblos rigorously observed. We may, however, take up what is lost, (Calmet) and endeavour to find the owner, who must indemnify us for our trouble; and, if we never find him, we are directed to give the price to the poor, for the owner's welfare. (Haydock)