You can't - and should not WANT to. Someone is looking for it, surely.
Turn it in to authorities = police, or Lost & Found of the place where you "found" it.
If you mean this, no:
Turn off Find My iPhone Activation Lock (formerly: Activation Lock: Removing a device from a previous owner’s account) - https://support.apple.com/HT201441 - If an activation lock was put on a device, only the owner of the account that applied the lock can remove it.
Question: can the apple ID be removed from the device?