I don't think this is related to Amazon's SLA. I had this happen to me too, but the package was marked delivered 2 days before it's expected delivery date, and

I don't think this is related to Amazon's SLA. I had this happen to me too, but the package was marked delivered 2 days before it's expected delivery date, and was actually delivered 1 day prior. So yes, strange it's happening, but might not be related to amazon's SLA.