They should be fine to just scan at the turnstiles unless it was a specific ticket where you have to register the date for the visit.
Go in person and talk to a supervisor for assistant
Or to be on the safe side just call them and explain the situation.
You have to go online on their website to get your tickets.
I'm sure you can, just go to the ticket booth or the entrance gate on the day you want to go. I have a pass and it got renewed at the gate when I went last week. Be sure to take your ID and old tickets.
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