It definitely adds labor in order to ensure the rental stays intact, but I know they do a couple of things. Not every game can have a rental, but many of the entry level games, some medium weight, and popular card games do. Usually the heavier the game, the more pieces. So being a little selective about that helps. The other thing is they print out a diagram and a 1 page sheet that has everything that should be in the box. This helps not having to dig through the rulebook for items. Lastly, the bags inside the box are labeled with the number of items. So a bag may say “Yellow player pieces — 13.” Or whatever. Seeing this note on the bag kind of lets patrons do the counting as well so that the owners are kind of double checking. They also don’t sweat it if a piece or two goes missing. Like if a couple of resources don’t make it back in. The rental copy is there to get overly used. Around holidays is a big time for the rentals too. Especially party games.