Shipping Chain of custody and liability through out

I've been buying and selling as a hobby on ebay recently, and see all manner or disclaimers about shipping.

I'm curious where the truth lay, since basically disclaimers only go so far, and can't trump law. A "Trespassers will be shot" sign does not give you carte blanch to shoot girl guides selling cookies.

Some shippers say "as soon as I drop it off at the post office its on you".

Other buyers feel that "you're responsible to get it to my hands, until that happens it's undelivered".

Some feel that the entire in between of those two is on the shipper.

The shipper and their million dollar team of lawyers disagrees, and even if you have insurance, will deny you because you didn't use the right font on the shipping label.

Or that after they drop your $3000 laptop off on the step on a busy street, and snap a pic it's on the receiver.

What's the truth?