Earlier quoted context omitted.
If you're buying eBay is great. If you're the seller however, it's an entirely different story. eBay heavily, heavily, heavily favors the buyer in almost all disputes -- so much so that at times it seems as if it's automatic to the buyer's favor. I guess that's how they get people to spend money on the platform, and of course take their cut of the transaction. There are tons and tons of seller horror stories, especia…
But what's the solution here? Without an escrow service which verifies the contents both ways, the best they can do is arbitrarily choose the winner.
A formulae that mix weight + dimensions + sender data + receiver data + followed route + category of contents. In several parts. Some parts (buyers adress, weight, category, etc...) can be verified for buyer, other for seller. The total formula is available only for the postman and would be easily verifiable.
When the package is sent, a mobile app sends the buyer a message with the buyer part that is checked against the data entered by the buyer in his/her own telephone. The buyer can quickly compare both md5 in the phone and must answer to the postman approving the message in order to the package being accepted in the post.
All returned packages have to be put in a special post yellow envelope available only in the post and checked against the maild5 using the weight and measures of the original (plus-minus a reasonable confidence interval). A machine calculates the statistic probability of having a different content and if under some p-value the postman will not accept the returned package.