/usr/share/man/man3/XmVaCreateManagedButtonBox.3.gz is in libmotif-dev 2.3.8-2build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/XmVaCreateButtonBox.3.gz
/usr/share/man/man3/XmVaCreateButtonBox.3.gz