Late delivery times are down to the Post Office normally. Change of routes and shift patterns I think.
The practice of carding when you have not got the package in your bag gets on my tits. It will be why the post office goes bust.
It's done because then they don't have to carry it back again.
I caught my postie doing this when he was supposed to be delivering a package to me. I heard him shut the gate after carding as he had not knocked on the door. When I caught up with him it transpired he did not have the package and assumed no one would be in to sign for it.

(I'd been waiting in for it)
Don't use the post office now unless I have to and probably never will if I can help it.