Folks, lets not jump the guns.
The OP intentionally and explicitly excluded naming the seller - and for a good reason as nothing would be set/clear at this point.
To point:
It is pretty unlikely the package content was like that when it left the seller. Or, at the minimum, was -supposed- to be like that. This is just too crude to be intentional on the seller side.
It seems very much like someone ad-hoc liked the package content so made an inpromptu improvised content from clay. Likely weighed based on the actual package content weight. That would indicate it is someone from the shipping path as such folk know that the shippers weight the packages multiple times over their path to detect tampering. A proper "fake" seller is much more likely to pack-in a non-genuine knock-off to ensure non-zero probability the buyers will be fooled and play in the grey legal area. Packing bricks is just too crass to be effective commercially.