/usr/src/virtualbox-guest-4.1.42/include/ is in virtualbox-guest-dkms 4.1.42-dfsg-1+deb7u1.
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/usr/src/virtualbox-guest-4.1.42/include/VBox/
/usr/src/virtualbox-guest-4.1.42/include/VBox/VBoxGuest.h
/usr/src/virtualbox-guest-4.1.42/include/VBox/VBoxGuest2.h
/usr/src/virtualbox-guest-4.1.42/include/VBox/VBoxGuestLib.h
/usr/src/virtualbox-guest-4.1.42/include/VBox/VBoxGuestMangling.h
/usr/src/virtualbox-guest-4.1.42/include/VBox/VMMDev.h
/usr/src/virtualbox-guest-4.1.42/include/VBox/VMMDev2.h
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/usr/src/virtualbox-guest-4.1.42/include/VBox/hgcmsvc.h
/usr/src/virtualbox-guest-4.1.42/include/VBox/log.h
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/usr/src/virtualbox-guest-4.1.42/include/VBox/param.h
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/usr/src/virtualbox-guest-4.1.42/include/VBox/version.h
/usr/src/virtualbox-guest-4.1.42/include/internal/
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/usr/src/virtualbox-guest-4.1.42/include/iprt/lockvalidator.h
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