How did you get hold of them/those/the tickets/those tickets?

Hi, teachers. Is the bold-face dialog sentence correct and natural? And which one of the underscored options would you find more natural here?

Dialog:

Guy 1: ...so last week I bought three tickets to the NBA All Star game next weekend in Vegas.

Guy 2: Are you joking with us? Why are you only telling us now?

Guy 1: Well, I didn't know if you'd be interested.

Guy 2: Are you kidding me? Of course we're interested.

Guy 3: Yeah. But how did you get hold of them / those / the tickets / those tickets?