Probably fell between the fabric and the floor pan, good luck without removing a seat.
I put extended seat rails in my EX with heated seats and didn't have to unplug anything. 4 bolts, 2 under plastic covers, very easy to take them out and move the seat around. If needed, the heated seat can be unplugged to give you more room to move the seat. You can probably tip the seat backwards and so what you need
I think there is a wire for the airbag... I don't know if that can be disconnected safely and wouldn't want to advise you either way there. I'll let someone more knowledgeable respond to that.