Maybe the dude just wanted to try an ancient perspective? Don’t know about the details of a helmet from that time - but I equate it to wearing your friends powerful subscription glasses. Agree with other post’s though - most likely he put it on to make a funny.

I am curious: Would a find like this be a huge “Payday”? Is it someone else’s property you just found (it belongs to whomever funded the dig)?

Edit: Repatriation and the Ownership of Antiquities.