This file is indexed.

/usr/share/kservices5/mbox.protocol is in kf5-kdepimlibs-kio-plugins 4:16.04.2-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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[Protocol]
exec=kf5/kio/mbox
protocol=mbox
input=none
output=filesystem
listing=Name,Type,Size
reading=true
writing=false
makedir=false
deleting=false
Icon=mail-folder-inbox
maxInstances=2
X-DocPath=kioslave5/mbox/index.html
Class=:local