I think a lot of people get away with ordering 10 or 100g packages of raws from overseas, just based on reading AAS forums. But I've read a few threads where things didn't go so smoothly. One guy went to the PO to get his package (raw powder) but lots of environmental ques put him on the alert (things, ppl, and instructions that aren't part of the required procedure to pick up a package). Anyway, he said he didn't recognize the sender, it wasn't his package, and he left. The guy waiting at the PO (probably a postal inspector/arm) was even trying to make the guy stay verbally (again, odd) and speak to the manager or sign for it or something, but the guy wasn't hearing that $hit and left in a hurry. Nothing came of it, presumably b/c he never signed for and took delivery of the package. He could have been charged if he left a paper trail online presumably-he didn't say anything about that.
The bad thing about raw powder via mail is when packages get damaged and white powder starts to leak out and...well, you get the idea (is it anthrax? is it cocaine?). I have a lot of relatives that work at the PO BTW
. The risk is low, but not non-negligible.
One of my close PO relatives has seen in person a massive steroid bust of a competitive bodybuilder, and a few street drugs busts (and nearly got in the way once). The steroid bust was domestic-a CA to SC operation. When they searched the dude's house later, he had ~3,000 pre-filled syringes in his walls (WTF) that he was distributing at a local gym (hmm...think somebody talked?). Now he's competing in the Department of Corrections invitational. Regarding the drug-mail busts, I am told that many of the musicians that visit the area where one of my PO relatives lives mail drugs to themselves so they will be there when they get there to perform (coke, weed, etc). Pretty stupid and pretty common for that area at least, but back to the white powder issue...
Anything involving the PO means federal charges instead of state charges by statute. The state could additionally charge you for other offenses perhaps. Federal courts have close to a 90% conviction rate which is much higher than state courts.
The 10 versus 100g could possibly help avoid a distribution charge on the whim that you actually get busted. You would still likely have to make a case for non-distribution though b/c they will convolute the math and see how many esterified amps you could make from the raw base powder, etc (maybe slight exaggeration, but they may try to hit you with intent to distribute either way). But in either case, you will be charged with conspiracy to import a controlled substance and conspiracy to distribute or conspiracy to possess a controlled substance and possibly possession of a controlled substance if you get busted after taking delivery of the package. Those conspiracy charges have at least as many teeth as a standard distribution charge, and it probably won't be concurrent sentencing either.
Most likely your package will arrive undamaged, etc. However, your package could arrive damaged (and suspiciously leaking), or the notice could get put in the wrong person's box.
I may be giving the raw suppliers too little credit though. Hopefully, they have a more creative way of packing raw powder than the stereotypical "bag". I've never ordered any (was considering it at one point), so I don't know much about that aspect.
If you do go that route though, I'll be curious to see what the TD base results are like versus esterified IM.