JF,  There is no record of any whippings taking place.  Actually, there is virtually no record of Oregon expelling anyone.  But there is a record of law enforcement telling a blackman to leave and his white neighbors coming to his defense and the law in the end not being enforced.  I suspect the real reason blacks didn't come to Oregon prior to WWII in any significant numbers is because there was nothing for them to come to Oregon for.  I seriously doubt blacks were even aware of the law, hence not an effective deterrent for moving to Oregon and basically useless in making blacks leave if they came.

Mostly what is written about these laws are the existence of them and a lot of postulating about them.