Anything I've thought of so far always ends in "and then the underpaid delivery guy gets fired and starves to death" or "and then the person packing the boxes has their wages cut"
Are there methods here that actually just harm the COMPANY not the people who happen to work there?
Become an affiliated seller with the company and supply counterfeit goods. People will purchase goods from you allowing you to receive money however due to the river company's mixed inventory policy the purchaser will receive either a counterfeit good that cannot be directly traced back to you for which the river company will eat the refund or the purchaser will receive a genuine product supplied by one of your competitors.
it's really cool how they get away with providing a flimsy illusion of a marketplace