what if the problem occurs with in the couriers responsibility ending the buyer receiving a damage or different product how can the seller defend him self when accused of scamming? can they send proofs before delivery? and how about when the buyer demands refund if its not the sellers fault when the product have problems, sure their will be an investigation what if its on the couriers party's fault how can coins be returned?
My wild guess would be "custom return policies".
And this is not new to existing classified platforms and avenues. More so, for used items.
And again, as stated in Fair Ninja's whitepaper, reviews and ratings will be applicable for both seller and buyer, thus, i doubt any of the said party would try to purposely sell or return an item just for the heck of it without guaranteeing the good is either good (on the seller's part) or bad (in the buyer's perspective).