I ended up chatting with Microsoft tech support online.  Via remote access they were able to look at the Dell invoice I pulled up for them and confirm that I had purchased Office 2016.  They set up a new Office account for me using the Hotmail address I gave them, so that I would always be able to recover and re-download the program if I had another issue with Windows.  It wasn't a perfect solution, but talking to Microsoft was relatively painless and quick.  I'm not sure what you're supposed to do if you have several computers for which you're responsible - it doesn't seem logical that you'd have to come up with a Microsoft account (Outlook, Hotmail, etc.) for all of them.  It looks like Microsoft is pushing Office 365 (vs. a permanent license) for businesses, which just sounds like a pain in the rump to me!  (I hope the recommendation to talk to Microsoft is helpful to anyone else who runs into this issue!)
I purchased an XPS 13 and chose to purchase a permanent license for Microsoft Office Home and Business 2016 for my computer as well. When I received my computer, it was unable to complete the initial start-up installation process for Windows 10.  (This is important because I was never able to access my product key for Microsoft Office Home and Business, nor could I assign a Microsoft e-mail account to my Office product.)  After talking to Dell tech support, I was told that the start-up process of Windows on my computer was corrupted and I would have to reload a new version of Windows 10 on my computer via a USB drive.  I did this and was able to load Windows.  However, there was no version of Office on this new version of Windows that I had to install.  I went to My Dell Downloads to download it again and the only program listed there for my computer was McAfee.  I sent two e-mails to Dell asking if there was a way to recover my product key or receive a new product key but received no response.  Please, is there any way to either recover my product key or get a new one?  (Or at least get a refund for what I paid for the Office program?) Thank you very much for your help! 
Lost Office 2016 after Factory Reset