My recommendation for pulling forfeits is, “be consistent”. I feel that this task should be done daily even if you only have one or two items on the forfeit list. One reason for this is if it's done frequently, it's a small task. But if allowed to build up, it can easily get out of hand and become a chore.
The main reason I recommend pulling daily is that customers buy what they can see. You may think that your customers know to ask about inventory in the back, but most shoppers never do ask.