... each time a RR participant receives a RR, it is their obligation to inspect that no dupes or damaged items are in the RR upon receipt ... and insures that there are no dupes or damaged items when the RR is forwarded to the next recipient.

If the person who upon receipt of the RR ... (any RR) ... would report dupes or unacceptable or damaged cards/keys to the RR organizer; we would know who inserted them and that individual could be barred from participating in future RR's.