Lol, that`s funny. Well, Fry was supposed to be in the future as shown in that episode, so he was protected somehow. Besides, those cryo tubes look strong. Maybe when picking up the ruins of NNY, they found frozen Fry, possibly along with others and moved them to the building he woke up in, made on purpose to be a replica so the frozen people wouldn`t be TOTALLY shocked when they awakened.
Something crossed my mind: I wonder if there`s a law against unfreezing people before their time. Wouldn`t the scientists remove Fry when they found him?
But this mystery was revealed! We found out where the party whistle came from
I think Groening has read some of the things at the Futurama Chronicles. Also, I make up a lot of Futurama stories, both turned into scripts and not. A LOT of times, situations I thought up actually happen on the show, it`s creepy!