I sat down to do a little detective work on this. Not easy, and I am not the worlds greatest detective! More like Monk or Columbo. Here is what I found, hopefully not too much overlapping on where you got, and maybe only a little help. In the order above:
kuid:104609:1217 Amtrak Budd Baggage Series 1700 Ex Sp Phase IVB by
Perrock. See notes on Perrock below
kuid:138423:1100071 Joram24 He appears to be at
RRMods.com. Could not narrow it down as far as what they are
kuid:138423:1100072 (wouldn't it be nice if they all put KUID lists on their sites!)
<kuid:375451:100288> DPR 70ft bulkhead 2 Dragonharh Found an obscure post from around 2010 Where
VIA415 suggested someone look under DLS for an asset under his old username
Dragonharh. VIA415 appears to be a member here:
https://daylighttrainz.wixsite.com/cprworks/site-members
But lo and behold, when I looked in CM at the name VIA415, I found this:
<kuid:134612:100401> DPR 70ft bulkhead 2 via6415 Installed from DLS
<kuid:542976:101313> GE P42 Amtrak 128 V by gramma
<kuid:542976:101314> GE P42 Amtrak 42 V
<kuid:542976:101315> GE P42 Amtrak 99 V
Another odd one.
I have these, don't know where I got them, but when I looked in config.txt, I found this:
author "Peter Hochgraf (
PerRock)"
organisation "Amtrak Trainz Group"
contact-email (pm me or him if you want the email)
contact-website "www.AmtrakTrainz.co.cc" (Note: This site does not appear to exist)
license "Reskin from original GE Genesis by gumbytrain available from
www.Protrainz.com.
Protrainz has no assets at this time. It appears to have gone away for a few years and MAYBE come back. There is no date on the site saying he is back, but it is dated 2020.
BUT,
Perrock appears to be alive over at
http://americantrainz.com/locos.html
By the way, if you find the three locos, mine are all missing this asset, but it can probably be substituted: AMTK 1st Gen K5LA: KUID:450586:100030 flamerailzzz
Finally,
<kuid:93368:40001>, this is what I found:
Dock trans (Robla) kuid:93368:40001 from Marek_5, a Polish Creator.
Try the Polish forum: http://www.trainz.webd.pl/engine/
HOWEVER, I have one asset with this KUID 93368, and it is by Marek_2, and I found this:
https://trainz.luvr.net/myprojects.php?Marek_2
I don't know how much of this will help, so I will wish you luck, and maybe others out there can help you narrow things down....