Where was the earliest tangible evidence of locking devices unearthed?

Answer

Nineveh

The earliest tangible evidence of security evolution, often called the Nineveh lock, was found in the ruins of Nineveh, the capital of ancient Assyria, near modern-day Mosul in Iraq.

Where was the earliest tangible evidence of locking devices unearthed?
Originsecuritymechanismlockkey