This file is indexed.

/usr/share/hybserv/help/seenserv/seennick is in hybserv 1.9.5-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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Syntax: %bSEENNICK <nick>%b

This will give 'last seen' information for the specified
nick, only displaying IF there was an exact match with
its QUIT reason (or nickname change).