/etc/X11/Xresources/xlockmore is in xlockmore-gl 1:5.31-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | ! number of minutes to logout button, -1 disables
! this will take effect the next time X is started
XLock*logoutButton: -1
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