Map Jam 7 (also known as "Back to Base") was a community mapping event held in on the Func_Msgboard . The "interesting report" typically refers to the readme or technical documentation bundled with the maps, which details the unique constraints of the jam:

: Inside Jam7.7z , there is typically a jam7_readme.txt or similar file. It contains the "interesting" developer notes from each mapper, explaining their design choices and how they worked around the jam's limitations.

If you are looking for the documentation or the maps themselves: