The replica helmet looks superb to me.
The Chest Pack: I can't say whether or not that's original, however, it does look a little distressed like original props often do.
It looks in remarkable condition considering it's age. I did overhear a conversation while I was there from someone who speculated it might actually be from 2010: The Year We Make Contact.
However, the description card is quite clear.
My thanks to Jason Joiner for displaying it.