/usr/lib/engines/engine_pkcs11.so is in libengine-pkcs11-openssl 0.1.8-2+b2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/engines/../ssl/engines/engine_pkcs11.so
/usr/lib/engines/../ssl/engines/engine_pkcs11.so