In that case could you please speak with the Support Team through the site here?
They should be able to look into this for you and provide you with assistance.
Thank you
Finally I found the Deluxe items thanks to another post in this forum. To find your items, liberate the Johnson Lookout Tower in the first island and walk to the nearby General Store. Goto the weapon section and you would see the Deluxe Edition items. Still unable to find Doomsday Prepper Pack and Day 1 Sniper Rifle.