I was too-frequently accused of sending payments in late, and one time i was in negotiations with them to cancel their check and write a new one and it came back, looked like they had walked on it for a month instead of delivering it 50 miles away. so i put it, as-is, in a bigger envelope, sent it out again, and they never again argued when i told then it must still be in-the-system. North or south, or east, up in these mountains, often take over a week to get to a place i can drive to that day, but coming from the east may take only a few days.
Another time, a package was msg'd as delivered, but couldnt be found, was traced as delivered to the neighboring box, and that inadvertent recipient but Return To Sender on it. It got caught in jamaica bay, on the way back to the ukraine, and finally delivered.
Also, I dont like dhl, they like to open my packages and badly retape them, (but i havent lost a watch, yet) if they are not stuffing them between the garbage cans and signing my name themselves, so anymore i have any dhl deliver't to their depot at the airport.