Both yesterday and today i open a chest in a Map for the masked Antique ruins people dungeon it showed on the screen that i got a master tool kit yesterday and today an expert tool kit then i checked inventory and there was no took kit and chest content was gone
its probably in your 3rd storage tab > Strong hold and trade skills > Others materials
if that is what u looking for.
Welcome to the Lost Ark forum community, gurskyd. Did you check where Power_byCat suggested?
Thanks for asking this!