Why didn't I receive the cross-game vehicles in Fortnite?

If you haven't received your Rocket League items in Fortnite, check the following:

• Your Rocket League account must be linked to your Epic Games account. If you haven't done this yet, follow the steps for your platform: How do I get my Fortnite, Fall Guys, or Rocket League progress to sync across all of my devices?
• After linking, launch Rocket League on the platform where the item was earned or purchased and sign in before checking Fortnite.

Notes:

• Not all Rocket League car items are shared with Fortnite. If some items appear, but others don't, that is expected behavior. Refer to Which Rocket League Items Can Be Shared Across Linked Accounts? for the full list
• Vehicles with variants may appear in Fortnite as only the base version. Access variants through the Edit Style menu on the base version in your Locker.
• There may be a delay in items being cross-granted in Fortnite. Please allow up to 48 hours after unlocking an item in Rocket League.