Will the treat/trick cards disappear on the 4th?

[Registering]

If you trade in your letters for the actual cards will they automatically disappear whenever the server goes down to remove the event?

They don't have an expiration down but I dunno, it is an event item.

[iNub]

they will turn into lotto 1x2 and when u log out they will disappear.

[Registering]

I'm not sure what that is, but in the end then they are useless?

[Palomar]

Yes they will be useless.

open them before the 4th.