We don't know for sure if someone has already won the Rolex, Iphone or Amazon giftcards prizes, but in positive case, it would be a good propaganda for the platform if the winners came here on this forum to share their winnings with the community, just like they do when hiting the 20$ prize on the free hourly faucet to receive an extra reward. If freebitco.in gave, let's say, an extra 10$ or 20$ for Wheel's jackpot winners I'm sure they would come here at bitcointalk forum to tell us about their winnings. However, I also have the impression nobody has won those prizes yet.
I also don't think there are any users who have been lucky enough to win a Rolex or iPhone from Wheel of Fortune yet. In principle, this is not surprising because even such prizes as 3,1k sats/RP or 1,5,50 golden tickets are rarely won. I guess once a user is lucky enough to win a prize like a Rolex, freebitcoin will most likely announce it themselves because it's a very rare event.