Air bag warning

[Matt19989]

Hi all 

just recently purchased and s Reg A3 1.8t it was brought to be fixed had a smashed headlight and split bumper

drove the car home it went fine parked up and the next day went to the car and noticed there is a sticker by the passenger air bag saying that the air bag is deactivated and I have asked the person how long it's been there and no luck yet I have done a little search but can't find anything out about this 

hope someone could advise me don't want to have got a lemon