In my case, a buyer contacted me ~5 weeks after delivery asking about his FedEx Overnight package.

When I checked, FedEx tracking showed that the package had been delivered and signed for - at an address "one street over" from where it was supposed to be delivered.

And then the real fun began...

FedEx eventually made good on the entire declared value of the package, but man, it was a lot of work!

In all honesty, I was surprised that they never tried to tell me that 5 weeks was simply too long to wait before notifying them of the problem.