Well, if you were hiding information from someone who could tap into any computer database, like Lore/Soul can, would you use something easily accessible by computer like CDs, or an on-line database, or something a little more...old-fashioned? 

Microfilm and Microfiche readers used to be commonplace. Now they're much less used....but not accessible on-line, which is a PLUS if you're trying to hide something from Lore.

According to an on-line source I found, "The average housefly weighs 10 to 15 millionths of a pound." So, figuring 100,000 houseflies per pound, times 160 pounds, is literally...sixteen MILLION houseflies. If it's the higher estimate, that's still over ten million houseflies.

If you wanted to cover an apartment quickly, and find something with a distinctive smell, you could do a lot worse. 

Cracks about "Lord of the Flies" would be too easy. Roll your own.