No, they didn't send actual brochures, they only sent some digital scans of pages that displayed 1980s Batavus Competition models in blue. I have those posted in this thread. If you email them with a photo of your mixte, they may do the same for you.

Mine came with no reflectors. Of course, I am not the original owner, and it's very likely the wheelset is not original. However, I believe the model I have was marketed to serious riders or amateur racers, not the
"general public", and we all know competitive riders would rather be run over by a car at twilight than add weight to their ride!

Your theory might bear out, though. You should start a database of reflector date codes!