/usr/include/X11/bitmaps/box6 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 | #define box6_width 6
#define box6_height 6
static char box6_bits[] = {
0x3f, 0x21, 0x21, 0x21, 0x21, 0x3f};
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