Delivery confirmation really doesn't help anyone 
but the seller.  It simply tells you when your 
package arrives.  Until that point, it doesn't 
provide any info.  And there really isn't anything 
to tie the handwritten receipt you get to an 
actual package.  Sure, there is the matching ID 
number, but you can send a package anywhere to 
anybody and then put whatever bogus info you want 
on your half of the tracking slip. 

As a seller, I use delivery confirmation to guard 
against buyers who might say that the package 
never arrived when in reality it did.  But as for 
giving the buyer piece of mind, it really doesn't 
work that way in my experience.

JP