Well yes, if they were delivered late enough, but with regard to 558 it was delivered in overall white like all the others. The only unknown aspect really concerns the aircraft's intakes as one image exists of the aircraft at Woodford with the lower lips covered by a tarpaulin. This suggests that it might have actually been completed with the smaller B1-type intakes which the first B2's had, and had the deeper intakes fitted later. Haven't managed to find any proof of this either way though sadly.