Oh no, I just bought something on Sephora and got the VIB Korean skincare sample bag with purchase, so I hope there aren't repeats, haha. Though if I like something, I guess I'll be glad to have more of it. If anything, the moisture or aqua bombs from belif seem to be the most popular thing right now, so I'd guess that.
For the record, I was never in either of the cities they originally opened it up to or the ones that seemed to come after that, but I did sign up immediately, so I think it has more to do with your numbered position than your geographic location. Or maybe it's completely random? Who knows.