The first Preview Optimus Prime is MOC. The others are MOSC.
Soundwave was a gift from my wife for Channukah 2018.
All are MOSC.
For some reason, Walmart released a second set of exclusives with a slight gold tinge to the previous silver package inserts. All are MOSC.
As a special bonus, Chevy and Hasbro teamed up to provide custom painted Bumblebee toys to Fifth Generation Camaro owners. Just bring your car in for service, and you were sent a toy that matched your car! Too bad this is another April Fools prank (Click here for the Commemorative Edition Tracks hoax).
1) The TFW2005 version was posted here: (Good news for Camaro Fans).
2) The Camaro5 version was posted here: (Good news for Transformers Fans).