There are no options at all.  2016 is the available version of office now. Dell does not replace the Microsoft Product Identifier card MPI card with the key on it. 
Can't find my Office key!!!  Do I have any options at Dell other than to repurchase the software? It came preinstalled on my Dell small desktop in October 2014.  And due to my stupidity I had to do a factory restore as my computer was hacked and I decided against paying $200 ransom for my password-locked, admin rights-revoked windows.   I hope the bad guys don't get one over on me.... Am I a lost cause? 
Lost Key for Office 2013