Sorry to hear that bro, it sucks, somone commented on the sources packing, well that is not necassarily a factor in this, yes if your reciving paperbolics, but other than that i dont think it matters a dam, a source normally packs with the intention of getting it through customs, I dont agree that theres a good way or a bad way, i feel that its a random method that postal inspectors or customs use to check packs, i.e 1 in 100 packs is checked somthing like that.
Aslong as your man doesnt leave tabs rattling in strips and amps clinking together then I think thats prolly the best he can do.
The rest I would say is down to chance.