Wallet items are in your WAX wallet as NFTs or Tokens. Buildings and Resources below are in-game only.
Reminder: If you do not see your Land Deed or your building blueprints in the Wallet Items, and you're sure you own a land pack, go make sure that you opened the pack! The game can only see the NFTs in your wallet once they are out of the pack.
Now I click the "DEPOSIT" button to add the deed to in-game resources, and after I confirm, I should see it in Resources, further down the Inventory page.