Buying an item that is not blatantly restricted (e.g. is not marijuana), on claims of the seller that it is legit, is good faith. Further, upon request from the

Buying an item that is not blatantly restricted (e.g. is not marijuana), on claims of the seller that it is legit, is good faith. Further, upon request from the original owner, it was returned. This is also good faith... aka "oops my bad". What they did in between is called "I do stuff to my property", and perfectly ok. Note: this was my thinking before I found out CA has weird laws about this (see other replies in this thread).