/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.
1 2 3 4 5 6 | #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};
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