Thanks for the answer on this, are the cursed boxes one time only or is there a way to obtain multiple?All cursed equipment is tied to the secret club or underground club dungeon (missing nurse main quest). Traps there will place random equipment on you, losing to boss will place lust crest on you, beating the the boss will award you with the item cursed box, which lets you choose cursed equipment.
To remove curses, buy holy water from photography club.
However, I don't think these items are represented visually anywhere outside of the scenes tied to this dungeon.