One possibility is extracards !
When set are released, factory has made extra cards for damaged and returned cards.
I have examble of Saku Koivu collection ( Three version )
98-99 #46 UD Black Diamond Quadruple *** / 100
98-99 #46 UD Black Diamond Quadruple ( no serial number )
98-99 #46 UD Black Diamond Quadruple ( hand made serial number )
I thin, if you have get damaged card unopened pack, and returned that to factory,
the use that ( no serial number ) card, and writing there the same numbering, which is the damaged card and returning that card with hand numbering to you !