[sudo-sys] RFID tags

I recently bought a set of 20 RFID tags to pass out to Sudoers. We've been individually adding people to the access list and tagging their codes with their names. When I left yesterday afternoon, there were 18 tags remaining. This morning, they are ALL gone. Additionally, there are 18 new RFID codes on the access list, but none of them have been tagged with names. This seems sketchy, so I've commented out the new ones for now. If anyone can vouch for what happened to these tags, please let us know? Thanks.