Sometimes orders are not downloaded from Amazon for whatever reason. The next sync doesn’t always grab those I suspect due to it downloading the next based on a time range. It would be handy to have a button to simply compare the orders on Seller Central not yet shipped, with those not yet complete in WPLister and find any which are missing. This would be triggered by admin button just in case you feel there are some missing, instead of comparing Order IDs one by one.