Visit their site if you've lost general items
Phones, wallets, electronic devices, state ID, bikes, keys. Items valued over $100.
The Department of Public Safety will hold items for 30 days. If the owner does not come to claim an item in that timeframe, it is turned over to Surplus Property.
Visit their site if you've lost your OSU ID card
Keep in mind it can take time for your lost property to make its way to one of these centers. Call every few days and see if your property shows up.
If you know what building you left something in, check with their main desk area. Many buildings' staff will hold onto found items for a while before turning them in to Public Safety or Central Lost & Found.