You can verify that your feeds went through successfully from ScanPower to Seller Central by going to https://unity.scanpower.com/list/feed. You will see a page that looks like this:
When you click FINISH SHIPMENT three feeds are sent to Amazon (product, inventory and price). Similarly, if you are re-feeding a shipment three feeds are sent when you click CORRECT LISTING (product and inventory) and MANUAL REPRICE (price).
If the STATUS of the feed is not successful it will say FAILED. You can hover your cursor over FAILED and it will indicate for what reason the feed did not go through successfully.
You need to be careful when re-feeding shipments as if you do too many in too short of a period of time Amazon will THROTTLE your feeds which will cause them to fail.