In the last several years, there have been 100's of millions of iDevices manufactured. Apple has actually sold over 1 BILLION iPhones (see, https://www.lifewire.com/how-many-iphones-have-been-sold-1999500. Some of the iPhones would have preceded Apple's secret use of BMG, but then there are the (100's ?)millions of other iDevices (iPods, iPads, watches, etc.) that Apple has also sold in the recent years. With several components per device, Apple must have used at least 500,000,000 - 1,000,000,000 BMG components. These 500,000,000 - 1,000,000,000 components are so small that they don't show up on a balance sheet?
No, but I believe that Apple only included those with the iPhone 3. So, I doubt that 100's of millions were manufactured.