If they don't have the fish in their own store they are not a seller but a trader (don't judge the words, I have no idea how to correctly express them in english)
In germany the biggest name when it comes to buying rare fish is like that, he has like 2 beautiful Aquariums in which he takes great imagines, but everything on his list is sold directly from the importers facility or others stores. And he charges hefty on top of the regular prices. But he at least sends you videos and imagines if you ask him for them. But its cheaper to buy directly from the stores/breeders than via him.
I would not buy in your store tbh. Like, how am I supposed to trust a store that doesn't even know/have visual access to what they are selling?
I hope they send you the correct animal, but if not just stick with them and don't buy there again.