I only tried "auval -a" for the first time recently and had the same issue.  
Also High Sierra 10.13.6.

I just tried "auval -32 -a" even though I thought everything was 64-bit (e.g., 
I don't use the 32-bit bridge in Logic Pro X), and sure enough that shows at 
least most of the ones that were missing.

Maybe I'm confused about the meaning of 32-bit in this context?

FWIW, this is what a failure to find a specific plugin looks like:

auval -v aufx Td10 Tdrl

    AU Validation Tool
    Version: 1.6.1a1
    Copyright 2003-2013, Apple Inc. All Rights Reserved.
    Specify -h (-help) for command options

--------------------------------------------------
VALIDATING AUDIO UNIT: 'aufx' - 'Td10' - 'Tdrl'
--------------------------------------------------
ERROR: Cannot get Component's Name strings
ERROR: Error from retrieving Component Version: -50

* * FAIL
--------------------------------------------------
TESTING OPEN TIMES:
FATAL ERROR: didn't find the component


> On Apr 12, 2019, at 3:00 PM, [email protected] wrote:
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>   1. auval only showing apple audiounits (Oliver Larkin)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Fri, 12 Apr 2019 11:11:23 +0100
> From: Oliver Larkin <[email protected]>
> To: [email protected]
> Subject: auval only showing apple audiounits
> Message-ID: <[email protected]>
> Content-Type: text/plain; CHARSET=US-ASCII
> 
> Since a few weeks ago when I type auval -a  on the command line I only see 
> Apple AUs.
> 
> Logic X however, when it runs auval can find the 3rd party AUs.
> 
> Anyone know how to fix that? This is on 10.13
> 
> Thanks,
> 
> Oli
> 
> 
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