It resets daily during the event period. For example if you get all the boxes the first day, it will reset the next day so you will be able to get the boxes again.

Will event ships be available to purchase during the event?  

This is a bit of a rant as I thought we were in an event already so I stayed up to get to Lvl to qualify for an event ship.  I make it to the level needed only to discover that no event ship at level I made or the ships below are available other than the ones I already own...

I had a good conversation with an understanding mod last night who took the time to explain why event ships were not available at the moment because they were given during the last ECV event.   All well and good but I thought we were in an event now and I know we have one posted to start the 31st.

Please make event ships available for purchase during events, thank you

 

It resets everyday, except the ones you already got I'm guessing.

I just want to know if the Event Ship exchange prize for EBB and ECV will allow me to exchange the ECV for EBB i would preffer that then exchanging the ECV for another ECV because the IJN ECV sucks compaired to using my Akagi but i enjoy my UK ECV since im still 6lvls from Ark