Try doing this to find out the name of the package:
# pkginfo -l | grep -i "box".
Be sure to do the next step to confirm this is the right package:
# pkginfo -l <pkg-name from above>

or if you know the name of any binary command that came with this package, (one of the 2 pkgchks below needs a full pathname to the binary/filename that you want to check -- I don't remember whether it's the "P" or the "p". Check that before using these commands.)

# pkgchk -l -P <cmd-name or filename>
or
# pkgchk -l -p <cmd-name or filename>

or

you can find out which package a command/file belongs to by grep'ing for it in /var/sadm/install/contents.