The Rabbis of Bava Metzia 29b worked out what a person owes to what he finds.
If you discover a lost scroll in the road, you have duties of preservation, not enjoyment. You may unroll it and read it — but only once every thirty days, enough to keep the parchment from stiffening into itself. You may not teach from it, because teaching draws the finder into proprietary use. You may not sit and read it in company, because two readers wear it faster than one. And if you cannot read at all, you must still unroll it periodically, so the scroll stays alive in your hands while its true owner is sought.
A garment is the same. Shake it out and spread it in the air every thirty days, so that moths find no foothold and the weave does not fuse. But do not wear it for display. The duty is to the cloth, not to your appearance.
Silver and copper vessels should be used occasionally — these metals tarnish when left idle — but not as ornaments for the house.
As for gold and glass: touch nothing. These do not need use to survive, and the risk of damage is too great. Leave them sealed until the rightful owner comes.
The finder is a custodian. The sages drew a careful line between care and ownership.