Even if your revisionist history wasn't, the "seller" used USPS flat rate, to 1) hide proof of empty box weight 2) use USPIS's de facto refusal to take/investigate/document whatsoever mail fraud cases (from personal experience) to get away with it. Even if victims could bribe USPIS to actually do their bloody jobs, would you just come up with another ex post facto requirement of proof, like fingerprints, DNA sample, fMRI, polygraph, notarized accounting of all bank statements for the past 10 years...
"Cannot determine" my ass, more like "we at bitmit are forever moving the goalpost into unobtainia in order to keep your coins".
Why do you have such negative rep here? O_o