I don't know, but I suspect the main hangup is only an imbalance in the sense of urgency. I'm hopping mad, while he's merely inconvenienced.
Yeah, that's an interesting question! But I don't know. Call me naive (you won't be the first or the last) but I think they'll be extra vigilant to not repeat this mistake.
If it gets resent the same way, then talk to the mail carrier before it arrives… put yourself on their radar. Might not help if you are not on a standard route or if there is a substitute carrier on that potentially fateful day… but knowing your mail carrier does help. Inconvenience. Yes.