Chosen Solution

I understand that the Server model is only available in a 2 drive configuration. Therefore it must have both cables. Also, the base model $599 version is only available from Apple as a single drive. Therefore it is definitely Not included. So, the question is, will a $799 mini that is configured from Apple in a single-drive configuration include the second cable as well, or not?

No, unfortunately Apple has decided not to include the proprietary second hard drive cables in their non-server models. Luckily, we include them in our dual hard drive kits along with everything else you need to install a second hard drive in your Mini. Hope this helps!