Pauly:
Every year at Trinity College they have a robotic contest. The robot has to enter a series of rooms looking for a candle and extinguish the candle. You could build a similar robot that goes from room to room looking for the items. Welcome to Trinity College | Trinity College I'm not sure how else you will know where the item is.
I don't want to have a robot because it is very complicated more complicated than just you should go in all the rooms and find the item. I was thinking to put a tag on all the items and some how send the information to the database in which room it is. But I don't know how it should find out in which room it is.