JwithJ, thanks so much for your advice . So do I just show up at that particular Coles store, tell them my problem and all the details (time, date, register, the guy that served me - i dont remembe rhis name but I remember what he looks like, hopefully they know their staff!) and they can look it up?
I remember the time because when I got into the car, I looked at the time in the car and it was 6:52pm and thought yay I'll be home in time to see Masterchef (lame i know, LOL) otherwise I wouldnt have remembered the time.