Unodewaal
Pack Dog
Reddit hosted a pretty good AMA session with a dude who used to steal motorbikes for a living. There are some good questions and answers in there to help you understand the whole process and how it happens.
Have a read through it:
https://www.reddit.com/r/motorcycles/comments/t5shp/ex_thief_chopshop_operator_ama/
Have a read through it:
https://www.reddit.com/r/motorcycles/comments/t5shp/ex_thief_chopshop_operator_ama/