Hi Alan -- that was a good smart guess, but the answer is... there's
nothing behind that white sticker!
The sticker may in fact have been original to the game, for just the purpose you surmise.
Twenty-five years we've been collecting and researching tabletop baseball games, and we saw this one for the first time
only six months ago in a Heritage auction. That one wasn't in nearly as nice a condition as yours, but there's no white sticker
in the upper right corner. There is some paper loss there, though, so perhaps the sticker
was there and was pulled off...
Ah! [dope-slap] We just now read the rules on the back. Check the last line. There ya go.
To your second question, we have no record of any other sports-themed game (which is all we really track) produced by
Boston Game Co. It's possible, of course, that the company made other games or novelties with a non-sports theme,
but a cursory check of our basic sources reveals nothing else of any sort by that outfit.