Ah yes, ČD style, leaves the seat reservation slips from the previous trip such that they cover the seat numbers (which are not on the seats themselves).
@poni at least better than Intercity where you have displays that mostly show "empty seat", sometimes it will show correctly at start but then disappears
@RafiX Czech Railways actually sell seat reservation until like basically departure time and even from intermediate stations, so you can buy a reservation for a seat someone may be sitting in.