I know Wagner "retired" in 1908, but are we sure he wasn't at spring training anyway? I couldn't find too many dates in a quick search, but this (see March):
http://dev.baseballlibrary.com/chron....php?year=1908
shows that the Naps started spring training on March 8 while it lists the date that Wagner announced his retirement on March 16th. If he showed up for spring training and became uphappy with negotiations while there he could have had put in a solid 8 days (if clubs started at similar dates) before calling it quits to force the owner's hand.