I don't think that no, is entirely safe. I wouldn't advise someone to say, No. I'm not saying, I know you're wrong. I'm just saying, that's not the way I did it, or advised others to do it. Saying no to most things, can turn into a hot seat.
Gotta say no once in a while to let them know you aint playin!
Still though sounds like Northbaypkg's management team is retarded if they are asking the same guy 3 days in a row to go take packages off a guy at 9pm at night.