The best I can do to help is provide the results of using find from the command line:
$ cd /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk
$ find . -name \*.h -exec fgrep -l OSStatus {} \;
./System/Library/Frameworks/AudioToolbox.framework/Headers/AudioConverter.h
./System/Library/Frameworks/AudioToolbox.framework/Headers/AudioFile.h
./System/Library/Frameworks/AudioToolbox.framework/Headers/AudioFileStream.h
./System/Library/Frameworks/AudioToolbox.framework/Headers/AudioFormat.h
./System/Library/Frameworks/AudioToolbox.framework/Headers/AudioQueue.h
./System/Library/Frameworks/AudioToolbox.framework/Headers/AudioServices.h
./System/Library/Frameworks/AudioToolbox.framework/Headers/AudioSession.h
./System/Library/Frameworks/AudioToolbox.framework/Headers/AudioToolbox.h
./System/Library/Frameworks/AudioToolbox.framework/Headers/AUGraph.h
./System/Library/Frameworks/AudioToolbox.framework/Headers/ExtendedAudioFile.h
./System/Library/Frameworks/AudioToolbox.framework/Headers/MusicPlayer.h
./System/Library/Frameworks/AudioUnit.framework/Headers/AUComponent.h
./System/Library/Frameworks/AudioUnit.framework/Headers/AudioComponent.h
./System/Library/Frameworks/AudioUnit.framework/Headers/AudioOutputUnit.h
./System/Library/Frameworks/AudioUnit.framework/Headers/AudioUnitProperties.h
./System/Library/Frameworks/AudioUnit.framework/Headers/MusicDevice.h
./System/Library/Frameworks/CoreFoundation.framework/Headers/CFBase.h
./System/Library/Frameworks/CoreFoundation.framework/Headers/CFError.h
./System/Library/Frameworks/CoreFoundation.framework/Headers/CFStream.h
./System/Library/Frameworks/CoreMedia.framework/Headers/CMAudioClock.h
./System/Library/Frameworks/CoreMedia.framework/Headers/CMBase.h
./System/Library/Frameworks/CoreMedia.framework/Headers/CMBlockBuffer.h
./System/Library/Frameworks/CoreMedia.framework/Headers/CMBufferQueue.h
./System/Library/Frameworks/CoreMedia.framework/Headers/CMFormatDescription.h
./System/Library/Frameworks/CoreMedia.framework/Headers/CMSampleBuffer.h
./System/Library/Frameworks/CoreMedia.framework/Headers/CMSimpleQueue.h
./System/Library/Frameworks/CoreMedia.framework/Headers/CMSync.h
./System/Library/Frameworks/CoreMIDI.framework/Headers/MIDIDriver.h
./System/Library/Frameworks/CoreMIDI.framework/Headers/MIDIServices.h
./System/Library/Frameworks/CoreMIDI.framework/Headers/MIDISetup.h
./System/Library/Frameworks/CoreMIDI.framework/Headers/MIDIThruConnection.h
./System/Library/Frameworks/Foundation.framework/Headers/NSError.h
./System/Library/Frameworks/MediaToolbox.framework/Headers/MTAudioProcessingTap.h
./System/Library/Frameworks/Security.framework/Headers/SecBase.h
./System/Library/Frameworks/Security.framework/Headers/SecIdentity.h
./System/Library/Frameworks/Security.framework/Headers/SecImportExport.h
./System/Library/Frameworks/Security.framework/Headers/SecItem.h
./System/Library/Frameworks/Security.framework/Headers/SecKey.h
./System/Library/Frameworks/Security.framework/Headers/SecTrust.h
./System/Library/Frameworks/Security.framework/Headers/SecureTransport.h
./usr/include/AssertMacros.h
./usr/include/Endian.h
./usr/include/MacTypes.h
