Your tickets can be used later if you pick them up on June 4. You can use the voucher after June 4 also. I'm not sure if you can use the voucher if you pick them up in October or November though. I'll ask someone and get back to you on that question.
Phantom, I bought the vouchers and dated that I will be picking up the tickets this August, but now I have a change of plans. I can still pick up my tickets in August but can't use them now, but we're coming back to Universal April 2011. Do you think these tickets can be used in 2011 or are they to be used only in 2010? Thanks for any help!