/etc/acpi/events/lidbtn is in acpi-support 0.142-6.
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 | # /etc/acpi/events/lidbtn
# Called when the user closes or opens the lid
event=button[ /]lid
action=/etc/acpi/lid.sh
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