Pilar has by now worked out that, whenever she appears for somebody, they have at least heard of her. Maybe they know her as Pilar and not the cake girl, back in the villa when this first happened; or they've heard a rumor about the cake girl, in the Imperial palace. But she has never landed with a cake for somebody with no idea at all of who she is and also not why she'd be there. And it goes by the final recipient, not by anybody who hands the cake over on instructions.
Pilar does not, in fact, know any Osirian adventuring parties, or anybody who'd plausibly be on one.
Which leaves the question of how an Osirian adventuring party knows either Pilar Pineda, or the cake girl.