- Found it
In addition to the 8 hide types for Level 1 and Level 2, for this one these four have been hidden and listed, if not yet found:
Unknown: Charlotte Area Variety Show Finder (Level 3) Challenge Cache - OU0ADD
Guest book: Free Little Guest Book - OU0ADB
MP3/Podcache: Stop, Drop, and Find - OU0AD9
USB/Dead drop: Free the Bookie - OU0ACD
It has taken a long time, much patience, and extreme effort, but I managed to get here without ever hiding a Letterbox.
I'd like to thank the GCGC, the reviewers, OCNA, the smart division of Mercedes, Exxon-Mobil, and last but certainly not least, geocachere for her patience and help over the years.
Thank you as well, OCNAChallenges, for this challenge!