Summary
It is important to remember that the IL tool receives its data directly from UPS data feeds. In addition, IL calls on APIs to get more detailed information not originally pushed to the tool. Therefore, there are only certain transit events that are recorded in IL. Below outlines which events those are.
Solution
UPS only notifies IL on Manifest, Delivery, Origin and Exception events. When IL is pushed those tracking events, we make a call to the UPS API to get all other events that UPS does not push to IL. In addition, UPS' API does not allow excess calling of the Tracking API without revoking access. Therefore IL can only update all other tracking events once a major event has been recorded.