As you have asked about the MBA internship in FedEx, I am giving you information about it, check below for the details
I want to tell you that currently there is no position for MBA internship in FedEx.
However, you can check its website regularly to know about it
To check it
Go to FedEx website
Scroll down
Click on Careers
Click on Search for Jobs
Click on Register Now
Click on Job Search, the page open look like



Here you will get the information about the MBA internship when available.

Here I found following:

Associate Clearance Broker
Clearance & Brokerage T/L
Clearance Broker- Associate
DepotOperative