Lost something in the passenger seat

When I got my car I only had one key fob. I picked up two more the other day and paired them without issue. I went to have the emergency keys cut and while getting out of the car my gf dropped one of the keys which ended up going down into the passenger seat, where the two parts meet. I've been googling how to get things out of there but it seems that any Prius seat search is assumed to be removing the back seats to get to the HV battery or replacing seats.

Is there an easy way to get things out of there? There's a flap on the backside that keeps things from falling through and my fingers are too big to reach through from the front. I don't really want to start poking around with anything that might tear up my leather.