So you just completed a physical count and have stumbled upon some items that were not accounted for, don't worry! These items can be added back in through inventory adjustments. We suggest creating an inventory adjustment reason called "physical count" to show that these adjustments are being made because they were missed during a physical count.
If too many items were missed to complete adjustments for, you might want to consider doing a Purchase Order. Before doing this, please know that this may create some discrepancies in your reporting. If you are integrated with Quickbooks online this will make it look like these items were received in twice, which may be confusing in the long run.