Mickk's post in the linked thread seems about right.
The first post in that thread, which lists concrete ships, seems wrong in multiple cases. Remember, that neither is official.
In general, if you RP "I stole it", then expect to be hunted by the owner faction.
If the BAF sees a Merc ID'd ship in Salisbury, it will be swiftly forced out. Refusal will be met with deadly force.