This address (39QWbnkbcPFcrJFEB6yvVDc12eX5zqVt3y) doesn't have a private key though: It has an unlocking script, the details of which I've given above. The private key needed in the script is the one belonging to the uncompressed public key in the script, which leads to the address 1PE3udPhhcSP4RAkVVuTPwQrGidVtkcaA4.

If you try to sell someone that private key, they will see an empty address. To lead them to the given address you'd need to first teach them about scripting. And if they can understand the script well enough to generate the given address, then they'll see through the scam.