that's a great question....
theoretically, no scraps ever made it to a factory pack( but maybe a fluke that a few got packed in a cig pack, but the probabilities are very slim)
most, were taken home by the original printers, designers, or factory workers......some may have literally been picked out of the trash bins at the factory in manhattan....
these cards eventually made it into collections...
collectors had no idea what they were 100 years ago, and still don't today..
they are like finding little gems in a mine.....
they are incredible and give little clues into how the set was produced...
even after over 100 years ago, new discovers occur and really are incredible..