The wearing should appear first on barrel front and rear area due to scratches created by slide movement. Check barrel and inside of the slide should tell.
From GB pictures, it has been fired -- new gun's bolt front does not have black circle, but not been fired a lot, much fewer than 500 IMO, due to the barrel section exposed in ejection window is like new. But the gun is in your hand, you can check more. Many people don't fire their guns, but could not hold their curiosity pulling slide open many times, that would leave light scratches on above mentioned areas too.
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