Page is a not externally linkable
-- Webmaster General
---- Bots keep looking for redirected pages
g1smd - 5:49 am on Aug 2, 2013 (gmt 0)Thread source:: http://www.webmasterworld.com/webmaster/4598611.htm
It seems the bot is programmed quite differently to how Google does things.
Serving the 301 response is lightweight on server resources so I wouldn't worry too much about it.
Brought to you by WebmasterWorld: http://www.webmasterworld.com