Good News for Marketplace Orders via Amazon

[Sussudio]

i really like this; amazon's recent updates to their site have been pretty cool and seem to really be geared toward helping their customers out (trade in games/movies, rate packaging etc). however, i'm curious: couldn't a seller hypothetically say that an order has been shipped an hour or so after the sale (even if it hasn't) in order to receive the money faster? it's not like every order now requires delivery confirmation or any sort of numerical confirmation, right?

i guess if the buyer receives the item and the date on the postage stamp doesn't match up they can file a complaint or something?