I see this was 5 years ago, what was the outcome for you? I also run the FOA and am trying to get a full overview of its process, and have come across your thread.
However, in the FOA, you are scanning noticeable gaps which is essentially confirming that the product is not on the shelf - sometimes you might scan a gap and there would be a whole delivery of the product sitting out the back, or even on a plinth, and so scanning the gap is essentially removing and inventory systematically and telling the ordering system we need more.
After the FOA, you should have been asked to do a skrinkage report, which then lists the higher numbers of stock that have been removed from inventory (I think it flags up on shrinkage with 10+ items removed), you can go round with the shrinkage reports trying to find why such large numbers are even on it.
Now part of my research into this is why would there not be a shop floor inventory and an