Marion Star 1931 Papier Mache Mold "Flongs" Rare newspaper typesetting/printing

Description

Super Rare and never available to public......3-Papier Mache Flongs.  Usually only seen in printing and industrial museums.  And here are 3, from 1931 and 1932.  These were found in the old garage of a past newspaper editor. He brought them home for some reason way back when and they were forgotten about.
Never heard of flongs? It's mainly because they were not designed to survive past the day they were used and certainly not expected to be still in existence 90 years later!  The protocol was to burn these after use.
A flong is a papier mache mold that’s made by pressing its raw, flat form into metal type and images. With this mold in hand, printers used casting chambers to pour in metal and create its counterpart, the stereotype, a solid plate used for printing.  These 3 look to be the newspaper page mat variety, in that they look to have been flat when used, not curved as most were.
The flong is an unsung hero that arose in the 1800s alongside important developments in high-speed presses, papermaking, and hot-metal typesetting.
Info on these 3:
Made from papier mache, they are like a hard board frim but very fragile.  They are all (or in the case of one, were, 19 1/4 x 22".  All are aged, dirty and faded brown but they are paper based so I did not try to clean.  Various cracks and rips but the overall articles are generally intact.
All from the Marion Star.  One dated 12-23-31, going by a date on a comic another one dated 12-28-31 and one dated 1-21-32.  The one with the comics is missing a triangular chunk at the top.