Since you have read that policy, read the one pertaining to defects for late shipping

Including defects, higher % of fees etc

eBay is all about the buyer and allows the buyers to do anything they please

Unless by 'documented evidence' you mean how eBay 'mark as posted' as soon as a seller generates a shipping label 

Which is what many buyers come here and claim 

As they do if a parcel misses a scan 

Have you reported these sellers to eBay with your evidence ?

Have you marked these buyers down on their 'star ratings' ?

Otherwise, how do you expect eBay to have any idea when the postman/woman delivered?

No idea what documented evidence you hold, but you need to provide it to eBay