Just off the top of my head you might also contact Joe St Charles, the son of Glenn St Charles, who ran the Pope and Young/St Charles museum in Washington State for many years. Joe ought to be able to either tell you about the arrows or tell you where to look. You might also want to go to the Pope and Young website and contact the museum directly.
The only way I know to get in touch with Joe is to go on the big auction site, do a search for stcharlesarchery and then send Joe a message. Give him some time to answer, he is both old and busy.
One thing for sure is that there is a ton of good information available through this site and you never know where it will come from. Two years ago I barely knew who Glenn St Charles was.
DDave