We purchased our 4 adult 10 day park hopper tickets from UC tourist in May 2008 to save some $$'s for our 2010 Easter week WDW vacation.
They came well packaged to our home.
I called WDW ticket CM's (Monday thru Friday, 8:30 AM to 4:30 PM, 407-566-4985, option #2) and asked if the tickets were valid.
You need to tell the ticket WDW CM's the letters and numbers on the WDW tickets .... mine begin with J--- Tr## W--### and our date 05/##/08 then the ticket number ####.
The CM said the tickets are 10 day park hopper passes and will expire after the 1st day of use.
So yes, UC tourist sells valid tickets.
Not sure abgout placing the tickets on your room key.
We were always AP holders before and the our beloved Dolphin is not a WDW resort.
I wpuld just ask the front desk of the WDW resort when you arrive - or maybe call the phone # above and ask if the tickets can be attached to your room key. But I would have the WDW tickets in your hands before you call - or they will not be able to verify the WDW ticket.