This is where I document all of the preview thumbnails that do not match the actual leak models.
If there are any leads on the "lost" variant, I'll post what I know in here.
	- CrazyBubba64
	- Last updated 6/6/2016

APC.mdl  :  The thumbnail shows the early VAB, while the model ingame is a very simple version of the retail model.
Barney.mdl  :  The texture shows the E3 version of barney, while the leak ships with the retail model.
houndeye.mdl  :  The thumbnail shows the model, but the .mdl file is empty/corrupted.
manhack.mdl  :  The thumbnail shows an orange-ish version of the manhack, while the leak version is green/blue. 
odell.mdl  :  The thumbnail shows correct textures on Odell, while the actual leak model has several UV problems.
police.mdl  :  The thumbnail shows the police using the old textures present in the leak, the actual model just uses the retail "_sheet" composite texture.
roller.mdl  :  The thumbnail shows a plain metal sphere, while the leak model is properly textured.
WScanner_Pair.mdl  :  Thumbnail shows models correctly textured with a greenish material.  Leak does not contain any of these materials.
WScanner_Single.mdl  :  See above
WScanner_Tri.mdl  :  See above

props_c17/canister_propane##... :  These models are using a skin not present in the leak in their thumbnails.
props_c17/fountain_01.mdl  :  Thumbnail appears to be white, leak model is the same as retail.
props_c17/lamppost01a_bent.mdl  :  Thumbnail shows the correct texture, while the leak model's texture is incorrect.
props_c17/lamppost03a_off.mdl  :  The thumbnail shows an older version of the prop, but the leak model is a modern street lamp.  The textures for the old model do not seem to be present in the leak.
props_c17/lamppost03a_on.mdl  :  Same as above.
props_c17/oildrum001.mdl  :  Thumbnail shows an orange barrel, while the leak model is identical to the brown retail model.
props_c17/tools_pliers01a.mdl  :  Oddly enough, this model isn't even present in the leak.  Strange how a thumbnail would be.
props_c17/tools_wrench01a.mdl  :  See above.
props_c17/windowframe04a.mdl  :  Texture is applied properly in the thumbnail, but not in the leak model.
props_c17/windowframe06.mdl  :  Texture is applied properly in the thumbnail, but not in the leak model.

props_citizen_tech/windmill002a.mdl  :  Thumbnail shows missing textures, while the leak model is correctly textured.

props_combine/Combine_Barricade_Shield001.mdl  :  The thumbnail shows part of a blueish sort of thing, while the leak model is a neat orange animated wall.
props_combine/health_charger001.mdl  :  The thumbnail appears to have an incorrect texture applied.  The leak model appears fine.

props_rooftop/dome003.mdl  :  thumbnail appears completely black, and may also have a different mesh than the leak model.
props_rooftop/rooftop_cluser01.mdl  :  The thumbnail shows a missing texture, while the actual model is textured properly.
props_rooftop/rooftop_cluser03.mdl  :  See above.
props_rooftop/rooftop_cluser05.mdl  :  See above.


props_wasteland/controlroom_monitor001b.mdl  :  The thumbnail shows a weird tranparent blue version, while the actual model has normal textures.
props_wasteland/controlroom_storagecloset001a.mdl  :  See above.

shadertest/shaderslab*  :  These do not seem to render correctly in the thumbnails.  The leak models are fine though.

zombie/poison.mdl  :  Thumbnail shows a very old model, similar to the fast zombie or old "fat" zombie, actual leak model is very similar to retail.