Purchasing a Used 2023 Model Y

My wife and I will be purchasing our first Tesla here soon! But just wondering what is there to look for when purchasing a used Model Y? We’re planning on buying it from the Tesla website as it seems like that’s the most reliable and easiest way to do it. But I see everywhere here to purchase a Model Y with HW4, is there anyway to tell if a 2023 model has HW3 or HW4 on the website? I’ve seen on some dealer pages around us they include it sometimes on their descriptions but not seeing much on the Tesla site. Any more tips or things to look for would be a plus too :)