/usr/share/php/Horde/Kolab/Storage/Folder/ is in php-horde-kolab-storage 2.0.5-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Horde/Kolab/Storage/Folder/Base.php
/usr/share/php/Horde/Kolab/Storage/Folder/Data.php
/usr/share/php/Horde/Kolab/Storage/Folder/Namespace/
/usr/share/php/Horde/Kolab/Storage/Folder/Namespace.php
/usr/share/php/Horde/Kolab/Storage/Folder/Namespace/Config.php
/usr/share/php/Horde/Kolab/Storage/Folder/Namespace/Element/
/usr/share/php/Horde/Kolab/Storage/Folder/Namespace/Element.php
/usr/share/php/Horde/Kolab/Storage/Folder/Namespace/Element/Other.php
/usr/share/php/Horde/Kolab/Storage/Folder/Namespace/Element/Personal.php
/usr/share/php/Horde/Kolab/Storage/Folder/Namespace/Element/Shared.php
/usr/share/php/Horde/Kolab/Storage/Folder/Namespace/Element/SharedWithPrefix.php
/usr/share/php/Horde/Kolab/Storage/Folder/Namespace/Fixed.php
/usr/share/php/Horde/Kolab/Storage/Folder/Namespace/Imap.php
/usr/share/php/Horde/Kolab/Storage/Folder/Stamp/
/usr/share/php/Horde/Kolab/Storage/Folder/Stamp.php
/usr/share/php/Horde/Kolab/Storage/Folder/Stamp/Uids.php
/usr/share/php/Horde/Kolab/Storage/Folder/Type.php
/usr/share/php/Horde/Kolab/Storage/Folder/Types.php