IDK, but I was at the LHS back before XMas and we were talking about lipos.
The owner was complaining about the HK companies (HC) who sell super cheap lipos for prices they can't even get @ wholesale. My attitude was basically, good, helps grow the elec side of the hobby. LHS need to wake up to the new reality and adapt. Another LHS buys the zippies and resells them in their shop for a reasonable markup.
(#1 LHS has extremely overpriced Maxamps lipos and other FS just rotting in the case)
So the owner tells me what they are doing is illegal and some battery companies are complaining to the shipping companies trying to get them stopped.
Perhaps he's completely full of it and bitter, or maybe there is a grain of truth. You are not supposed to ship flammable materials like lipos undeclared. If they are shipping a huge volume, maybe they are starting to get some scrutiny. Goes for custom charges as well.
Hopefully not, but I can't think of a better explanation (other than them being wierdos.)