What is this I found with some nickels?

I found this with a lot of Liberty Nickels
4.25 g
19.99 mm diameter
1.79 mm thickness

 

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That "ear" between 7:00 and 8:00 on the first photo looks like the attachment point for an electrical box punch-out. Have you checked it with a magnet?

At those dimensions and weight, it might be a nickel that's had a lot of its actual nickel metal eaten away by acid. But my first guess is that it never was a coin of any sort.

 

I’m sure I have a couple in the bottom of my toolbox

 

Not magnetic. I thought punch out too. I'm leaning toward the acid eating a nickel possibility.