Thanks, the last time I mentioned the possibility people taught I was nuts.
The green thingie being symmetrical in shape may leave a false impression that both of the relay's posts have symmetrical aluminum conductors running into the green thingie,
mirror images of each other like your left and right arms for example. But the symmetrical-ness ends as soon as the aluminum strips goes into the green plastic.

Below, only the B terminal is capable of supplying electricity to the keybox regarding the B and M orientation. Meanwhile the M terminal dead ends in the green thingie
and only serves as a metal support piece. The M terminal won't send electricity to the keybox.

