Somebody left one on the counter face down and did not come back for it. I waited a respectable amount of time. Then it was mine.
The second one was easier. By the fourth I had stopped counting the waiting period and started counting the cards.
Nothing. I have never bought anything. I do not know the numbers and I have not looked at the backs.
I fan them out on the floor at night and put them back in order. That is the entire hobby and I am not taking questions about it.