The man should have remembered where he bought his lottery ticket so he could collect his prize. In those six months he should keeps his ticket by labeling it with where he bought his lottery ticket. But there should be no need to ask about that because he clearly bought and has the ticket.
Imagine buying ticket for more than 3 months and not winning up to the price that requires you to state the place you bought the ticket from (this one has a price that need you to know where you bought it) and also the fact that you don’t just patronize one outlet but different ones so it would be difficult for you to keep labeling them - he never knew that one of those tickets would be the winning tickets so he could have just treated them like he has been doing and hoping to get a little price from them - probably to win back the money he spent on them and then it turned out to be the real deal.
That’s just my personal guess, for me I won’t be able to keep up with the labeling stuffs most especially when others doesn’t require me to do it.
Maybe that is right that difficult to keeps all of those tickets and label it one by one. But that is the only way for him to keeps reminds where he bought all of those tickets. We don't knows when we can wins on the lottery so we should have a way to reminds ourselves.
I will be difficult to keep up with labeling the tickets but I will try it for myself. Every people will have their own way to reminds the place the bought the tickets. We just needs to do that for ourselves.
But that will strange if the store asking that because they will knows where the place when they see the tickets. If their verification is just show the identity of the winners, that will be no problem. Besides that, with the lottery belong to us, that shows that we are the owner of the ticket lottery.