Had to see if there was a way to check back because I have no screenshot of it. Found it; you're right.
"Rewards: x3 SR or Higher Guaranteed Gacha Tickets, x10 Elixer"
I honestly thought it was 10 but I may have gotten confused with the current crossover event or the elixirs ^^;
But still, even 3 SR+ tickets are pretty welcome in any case.. especially if you did play IWZ pretty actively.