Item tables describe what random items (mostly loot) an event (usually a monster dying or a steal loot skill happening) will drop.
The Law Bonuses thing is correct. The law bonuses you get correlate with the items in the slots which are gatekept by story progress. So, the first 10 law bonus sets are available at the start of the game. After like the Adele mission, you access sets 10-19. After the like Pearl mission becomes available, you access sets 20-29. This continues progressively until near the end of the game.
The Law Bonuses thing is correct. The law bonuses you get correlate with the items in the slots which are gatekept by story progress. So, the first 10 law bonus sets are available at the start of the game. After like the Adele mission, you access sets 10-19. After the like Pearl mission becomes available, you access sets 20-29. This continues progressively until near the end of the game.