Yeah, the ten ticket rolls can give you bonus tickets. I had one roll that gave me eight (one five ticket panel + one three ticket panel) and one or two rolls that gave me a few tickets. Ten rolls can also give multiple PRIZE letters so it might be possible to get an E as well as a P.
Nutaku and DMM IGN: Tomitain
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Nutaku Flower Knight Girl ID: 610834201 (inactive)
DMM FKG ID: 106750967
DMM FKG Allies: 109/123
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DMM Girls Symphony ID: 34644951 (inactive)
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Nutaku Mist Train Girls ID: 3355988
DMM MTG ID: MSTL0Q45K5E9
MTG Allies: 31/50 (Nutaku), 11/50 (DMM)
Yeah, I got the multiple letters in a 10X draw once. Obviously if you have the ten, you're going to spend the ten. I was just saying that if I was going to bother with individual tickets it would have to be when I already have Z and I'm looking for E. In other words, try for the item prize as soon as I can instead of waiting for ten tickets to build up again.
Really sucks that the daily puzzle piece reward is a different one from the last time so you can't go back and complete the previous event if you missed more than two days.
I really hoped that, with this being an anniversary event and all, obtaining the summertime costumes for Grace and Kelly would unlock them if you missed on the event (I hadn't started playing at the time) but it seems not, it's a bit of a bummer. That or the rewards displayed for the completion of the first mail topic are wrong.