And in the example being discussed, there was no mention of discipline so the inference is that this was not "guilty until proven innocent" which is what I was trying to explain to Cactus.
My experience has been that most of the time FedEx presumes the employee is guilty, especially if the complaint has come from an important customer. You mean nothing, and they'll toss you aside while they see if the issue has merit. If there's any chance FedEx will be sued, good luck on returning to work.
Many years ago, I knew a courier that had a homeless person dart out of a blind alley and into his path. The courier hit the guy, but there wasn't anything he could have done to prevent it. FedEx fired him immediately, no suspension or anything. A week later the police report confirmed that the victim was drunk, had run directly into the courier's path, and that there was no way anyone could have avoided hitting him. The courier gets a lawyer, shows him the police report, and he's back on the job within a week. Please note that the employee had to get an attorney first. FedEx did not hire him back immediately, even though the accident report had totally exonerated the courier.
FedEx is extremely risk averse, and I think they use the "guilty first" philosophy to protect their assets. Not always, but often enough to show a pattern.