The old thread is getting a bit long in the tooth so I'm creating a new one!
To give you an idea of what we've had available in our kafra shop boxes and packs in the past here's the big list going back a year. I'll continue adding to the list but at least you have an idea of what we've done in the past.
Items that have already been in a box, especially ones that haven't been in a box for a long time are items that we'd like to give priority to.
For new equipment we'll be posting up what new items may be in the box a week ahead of time so if there's something that would cause major issues with PVP/PVE balance you can let us know.
There are unimplemented equipment on Classic that is not yet available in the game. Pika had a great post
talking about these.
Tames, mercenaries and battle manuals and gums are likely to be included in the boxes.
Mental Pots, Mega Resist Potions, Party Buff Scrolls and Mystical amp scrolls have been in kafra boxes before, but people have argued for and against them.