/etc/acpi/volupbtn.sh is in acpi-support 0.142-6.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | #!/bin/sh
test -f /usr/share/acpi-support/key-constants || exit 0
. /usr/share/acpi-support/key-constants
acpi_fakekey $KEY_VOLUMEUP
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