The temptations presented by management-accessible lockers. After all, once an employee is terminated, any ramifications resulting from that termination will have to be dealt with by FedEx's legal department, not the manager who did the firing. All he or she knows is that they are rid of the employee they wanted to be rid of. Even if the terminated employee decides to pursue a personal lawsuit against the particular manager that fired him or her, the corporation will likely provide all the legal representation for the manager and pay any court ordered compensation either directly to the plaintiff or indirectly through reimbursing the manager. So, in effect, a manager is pretty much free to act with impunity if he or she really wants to entrap an employee.
Lockers are an entirely different ball game.
The answer is that it's a lot easier to defend one's self against a set-up like Mark's where upper levels of FedEx management are concerned than it would be if a package or its contents were planted in your locker. While you may have some sort of personal conflict with your manager, the layers of management above him or her in the an investigation or GFT process will likely know little, if anything about you until they are made familiar with your case. An argument could be made that a package in your truck could have wound up there several different ways either by accident or design. While I'm no lawyer, it only seems like a matter of common sense that it would be more difficult to convince a judge or jury that something found in one's locker was planted as opposed to a case involving a package found in one's truck. If your manager happens to be a good actor and you choke up on the witness stand, the outcome of your case could become a crap shoot with enormous stakes that you could lose just based upon circumstances rather than substance.