Just drinking (coffee) & thinking:
There is the "notes" animation track, but that is easily deleted.
There is the possibility of having a text message box pop up on scene open (via MaxScript). I'm uncertain if it would show on a "merge" or "import" though.
Hmm- that's it for me. Must need more coffee!
-Jeff
Max since 1992 (3d Studio) · Win 10-64 · Wintel workstation · 64 GB RAM · nVidia Quadro RTX 4000 · BB render garden via Deadline