Since you mentioned a sealed box, what does the box say? Return the laptop if you are not satisifed.  I don't know how you expect us to help with an item that you purchased from a 3rd party seller.    
Just recently  bought a 3190 an was supposed  to have 256gb ssd. But when checked it says 56gb storage..  have been conned.  Can't even find same for sale with  same storage..  was sealed in box aswell brand new..  is this some sort of display model??  Rams fine tho.
Dell latitude 3190