I have also had US postal service deliver a package to the wrong house and mark it delivered. Took the driver about a week to get it back from the wrong house and deliver to me. I have also gotten stuff meant for others - I just go deliver to the correct address when that happens. Has been a couple years on one of those episodes happening.
Occasionally we get the neighbors mail. Carrier is well past retirement age and the subs tell me he should retire. Often he goes by the house 2-3 times in one day delivering out of order. He must not be good at sorting or something or unorganized or they boot him out of the P.O. before he is ready to do the route. Don't know.
U.S. mail seems the worst. Had an insurance claim once about 5 years ago. Took about 3-4 months and appeals etc and they never paid the claim. Basically they have to loose it or the driver has to run over the package in your presence to get paid. Postal Insurance is worthless in my experience.