I've written in the past about the Japanese Collegiate All Star cards that were an insert in the 2008 Upper Deck USA Baseball box set. There were several different varieties of memorabilia cards for the members of the Japanese team for the 2007 Japan-USA College Baseball Tournament - jersey, patch, letter, autograph and flag patch. I have all 22 of the jersey cards but I didn't have any of the other cards until recently. I picked up an autographed card of Shirou Mori for a very low price on Ebay a couple weeks back:
Mori never played in NPB - he attended Kinki University and played in the corporate leagues for Matsushita Electric/Panasonic* after graduating. If this is to be believed (and is kept updated) he played for Panasonic from 2008 to 2014.
*Matsushita Electric changed their name to Panasonic as of October 1, 2008