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this got fixed "for free" when fixing bug 1220904 .  We no longer aggregate users from wtmp (limiting wtmp merely for determining login frequency).

To get a list of all cached users (by uid) run:

dbus-send --print-reply --system --dest=org.freedesktop.Accounts /org/freedesktop/Accounts org.freedesktop.Accounts.ListCachedUsers | sed -n 's@.*/org/freedesktop/Accounts/User\([^"]*\)["]@\1@p'

So then you'd just need to run id -u bob18695 to get its uid and then compare if it's in the list

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2522.html