This file is indexed.

/usr/share/X11/xkb/keycodes/empty is in xkb-data 2.10.1-1ubuntu1.

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

The actual contents of the file can be viewed below.

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default xkb_keycodes "empty" {
    minimum= 8;
    maximum= 255;
};