well, I have to say that I experienced both for Embraer flights. On a recent ZRH-CDG in a E190 there was this usual box with wet wipes, however I also saw that in other Embraer flights (KRK-CDG comes to mind), there were no wet wipes. Seems to be applied inconsistently. Can it be that they recently introduced this also for the ex-HOP flights, but one or the other crew forgot about to place it or there were simply not enough on board?