Upgrading from Standard edition to Limited edition

I'm not sure if I'm posting this in the right forum but I need some help.
last year I bought the standard physical copy of the game for PS3 but today I have decided to buy the physical limited edition for PS4 ( keeping in mind I already upgraded to ps4 for over 7 months now )
my question is if I buy the limited edition HOW do I get the extra bonus , as in mounts minions etc etc? Remember I'm buying the actual box not the digital copy.

Thank you in advance

Unfortunately you can't. That PS4 edition would be for a new service account only as you already have PS4 on your game account, you can't upgrade an existing account when you already have an account for that type of machine (PS3/PS4/PC).

The only way to do this is to add collectors edition for another format (PC or PS3 - since you upgraded PS3 to PS4 you can add PS3 again now) or to do the digital upgrade online.