I'm sorry, but something doesn't follow here. Either the Cops were stupid, thought you were, or this never happened, and here's why I say so: FIRST & FOREMOST, the cops would NOT come to the door knocking to ask you questions, saying that "they have a package for you, and they know what it contains, and that you're a small fish, and that they want the big dogs". In order for them to operate under even the BLANKET of "they have your ass", they would get a search warrant, and definitely try to deliver that package to you. From your story, it appears that they didn't even try to do that much, as you stated that on the day(or day after) it was to arrive, two Postal Inspectors just showed up to question you. That shit NEVER happens! They don't just seize the package, not deliver it(or even attempt as much), then just show up saying that they know what's inside of it, then expect you to squeal like a pig.
For them to not even try to deliver it is making me wonder about this story. If they really wanted you to talk, THEY WOULD'VE DELIVERED IT! Period! That way they'd KNOW you'd be scared shitless(because then they could've executed the Warrent--and if you're scared now, then you would've definitely been then--searched your house--taken your PC Etc--which would give them some actaul leverage against you), which would increase the chances of you talking. I'm not saying you'd talk---I'm saying how they get you to talk, and your story doesn't follow bro.
Also, why no mention of the Source? I don't see one at Meso(I understand why there isn't one here).
ALSO. Who approached you again? Narcotics officers? State boys?