Dennis posted; "Either the RR was too big (I sent it out with 155 different cards) and it was difficult to check if that replacement card was already there, or some of us need read directions"

One easy way to avoid putting in replacement cards (accidently?) is for everyone to maintain the card selection in alphabetical order. That way it would be easy to spot an existing card already in the RR. As for size... there is no such thing as a "too big RR"!