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It looks like this package is a ghost - there are only 6 pieces of ROS code in the entire GitHub, where it appears like some kind of accumulator of message types from maps, navigation, car sensors, etc.

• https://github.com/search?q=egn_messages&type=code
• https://github.com/tanmayj2020/pathplanros/tree/master/ma_rrt_path_plan has more info:

This repository contains the ROS package with code implementation of RRT-based path planning algorithm suitable for exploration of a trackdrive circuit according to the rules of Formula Student Driverless competition in Germany. This algorithm is based on my contribution to E-gnition, a FS Team of Technical University Hamburg.

Probably this message package was not open-sourced, so you can't find it. You can replace it with analogous messages from other packages and fix the differences, or try contacting the repository maintainer