https://www.polygon.com/e3/2018/6/14/17464318/fortnite-ebay-e3-exclusive-spray

Epic Games gave away a variety of items during its live Celebrity Pro-Am and party at E3, and those goodie bags included codes for 2,500 V-bucks — the game’s virtual currency — and an in-game spray that is exclusive to E3.

It should go without saying that these items are already being sold for large amounts of real cash on the secondary market.