ALWAYS order 2 copies of whatever niche "new" game you want. The chances of them splitting them are insanely low, so your order will always get sent to the warehouse or will get bounced to a store with 2 copies left (1 sealed, 1 gutted) and just return the second copy. It's as easy as that.
I disagree from my experience. Even when ordering two copies of niche games (NIS, Atlus, Koei, etc.), the shipments get split up all the time. I ordered 2 copies of trails as well two days ago, and those were split. And when I bought a ton of copies of fallen legion, it was always two at a time, and 90% were shipped 1 at a time from two different stores. I agree you might as well order two and you'll likely have better odds, but to say odds are "insanely low", I think is misleading. I think it doesn't help that since these are niche games, stores probably get like two copies max of these thing.
Good news is online returns makes things so much better now. A lot of stores won't let you return open games even with receipt, even though they know their practices.