The great-grandson of a ballplayer named Hick Munsell came on to the board a few weeks back and after doing a little digging into the NYT archives I saw that Munsell went to spring training with the Giants in 1912 at their camp in Marlin, Texas. The name Fullenwider came up several times in various articles and I was wondering if it was the same as the T209 guy.
NYT Jan 10, 1912; first mention of P.F. in archives (link to pdf file):
http://tinyurl.com/ybn7gbr
NYT Mar 17, 1912; last mention of P.F.:
http://tinyurl.com/ydyswps
This picture from the LOC site appears to confirm it.