Probably we have. I can't keep track. But you seem to be the only one asking this, and I'm willing to bet you have a similar skill set as most of the rest of us. I myself cannot claim to have the skills to reproduce such an artifact, and to be honest, neither would I have the interest to do so. In other words, how many of us here are professional stone masons? Realistically, how many here could craft such an object?
But obviously it can be done because...it was done. And it was done 5,000 years ago.