That is interesting. I spoke with a person named (I think) Carpenter shortly after the law was passed. I was passed along to him specifically because he was the final authority at the national office. He explained the intent of the law very clearly, and in fact, he was the one who used the words sold, bartered or otherwise exchanged for anything of value when refering to interstate movement.
All I can say is that the law is pretty specific. To me it's like calling a IRS help line looking for advise and when you follow it and get audited, you are still the one ultimately responsible.
If nobody is enforceing the law, then great. But the law is still on the books and the way I see it, anyone who violates it is still subject to prosecution if proper paperwork is not done.
Bottom line, people can do whatever they feel comfortable with.
Bill