As this is not one of Givenchy's most coveted bags, I hardly think it is a faux. Nevertheless, post your pics in the Authenticity thread for confirmation.
Personally, I think it is divine! Zoe Saldana has one in black and I love it. I saw it in straw and leather at a
Barneys outlet last year but the price wasn't good enough.
It is not unusual (unfortunately) to find luxe bags at TJ Maxx without a dustbag or tags.
May I please inquire as to where you purchased and for how much? Please forgive me, its just that I'm a TJ Maxx shopper and it would be good to know what kind of deal I could get for it at one of my nearby stores. Thx.