Deivery was close to 9PM but within promised time.  I found the unit to be clean, dust-free inside the case.  It was operational on connection to peripherals and power.  It booted Microsoft Windows 10, and I followed the setup up to the entry of my personal data.  At that point,  I terminated the setup at a pause and shut it down by powering off, the only way possible.  I replaced the 500GB HDD with a 160 GB HDD and rebooted, installing my preferred Linux Mint 21.  The installation went smoothly, and the setup was eased by my having prepared USB sticks with backup data and applications.  For $89. + tax and free shipping,  I did well.