Hey Princess,
LTNS!
I think the ones with the barcodes you can't reuse because they've already been scanned. The ones you print out ie Tomorrowland, High School Musical, and Thrillseekers you might be able to reuse. Still, I'd have backup printouts just in case if I were you. Just to be safe.
Are you going this weekend? Because I still have a couple of the gold collection PDF barcodes if you'd like them (I'd need to send them to your email though).
Hope you're well.
Tiki
EDIT: Oops, I'm wrong. Just checked and the barcodes aren't unique. Forget what I said!!!