A Tribute to the Boston Red Sox
To solve this puzzle, take a look at the baseball card collection below. Not all of these players are famous, but most are, and some of them are among the greatest legends to play for the Red Sox.
You can have a few swings in the batting cage on this puzzle at:

Once you've found the Green Monster, you'll have a little bit more work to do in the form of a Green Monster themed puzzle. Former owners of the Sox, the Yawkeys, are remembered on the monster in a particular way, you're looking for that.
It has a container in it for the log and a pen to record your name and the date you hit your home run. The box itself has plenty of room for tradeables. After you've finished, please return the cache carefully so that it is as hidden as a green monster can be.
Congratulations to the finders that cleaned up in the first three innings - FTF: @mcargister, 2TF: defiant980, 3TF: Merlot57