For context: I buy a ticket when I have the change and am walking past a newsagent; not very often. Then it sits in my wallet for weeks, then I'll get it checked when I remember and am walking past a newsagent. i.e. Not a regular player but I like daydreaming about what I would do if I did win.
Occasionally I am bored at work and check the numbers on the ticket in my wallet. Last week, at work I am pretty sure I matched 4 numbers on an OzLotto ticket (Division 6 so about $20). Yesterday I'm walking past a newsagent and I go in to get a ticket. I then remember I had a ticket (the ticket in question), but forgot I'd checked it at work as my mind was elsewhere. I give the guy the ticket and also ask for a ticket in another game. He scans the old ticket, "Not a winning ticket", meh ok and I buy the other ticket and leave. Today I remember checking the ticket at work and am pretty sure it was a winning ticket.
Question: Is it possible for the guy to have a known non-winning ticket at his machine, take my ticket, switcheroo, scan his non-winning ticket, I see 'no win' on the screen and leave? He then actually scans my ticket and gets the pay out for himself.
You can use The Lott's app to buy tickets, if the possibility of this type of scam worries you.