This file is indexed.

/usr/include/X11/bitmaps/boxes is in xbitmaps 1.1.1-2.

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

The actual contents of the file can be viewed below.

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#define boxes_width 16
#define boxes_height 16
static char boxes_bits[] = {
   0x0f, 0x0f, 0x09, 0x09, 0x09, 0x09, 0x0f, 0x0f, 0xf0, 0xf0, 0x90, 0x90,
   0x90, 0x90, 0xf0, 0xf0, 0x0f, 0x0f, 0x09, 0x09, 0x09, 0x09, 0x0f, 0x0f,
   0xf0, 0xf0, 0x90, 0x90, 0x90, 0x90, 0xf0, 0xf0};