The glovebox "box" is the dealer-installed accessory iPod adapter. What you are looking for is the USB adapter, which it is not available in the USA as a retrofit/dealer-installed accessory.
Contact forum vendor BimmerTech for details on how to get the OEM USB adapter retrofitted in your car.
-2012 E92 M3 Jerez Black/Rust Brown, M-DCT: September ED
-2008 E90 M3 Melbourne Red/Bamboo, 6MT: Gone
-2007 MK5 GTI United Grey/Grey, DSG: Gone
-2004 E46 M3 Carbon Black/Cinnamon, 6MT: Gone
-2002 E46 330i Orient Blue/Natural Brown, 5MT: Gone