BTW, if either way, the player, has no more coffee sacks, he must draw randomly one from de black bag. When all 5 of them are drawn, what happens?
a) players without coffee sacks in stock can still score but don't replace them?
b) or they cannot score anymore?
I haven't seen this happen yet but my guess would be that if someone had scored that many coffee sacks, they would have scored nearly enough to end the game (if they hadn't ended the game already). So the five sacks left over in the bag seem like they would be enough.
I guess that if they were blocked too many times then maybe they hadn't scored much, but as was noted above, the other players need to block with the same color of sack. Every block adds another sack to the "front" of the score track which is moving the game towards its end.