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According to the Haynes manual (I couldn't guarantee its accuracy though) there are 3 passenger compartment fuse boxes but unfortunately it does give the location of the two additional to the one on the right hand facia panel. Fuse box No. 2 mentions caravan socket, Sunroof, Rear electric windows and steering wheel sensor. Fuse box No. 3 mentions drivers electric seat supply, drivers and passengers heated seats, drivers electric seat and passenger electric seat.
Have you tried removing a few one at a time to see what stops working - that may give a clue.
Currently in madnoel10's garage:
Honda Civic 1.4l