Hi Bezeelebub,
I'm not sure what you mean. What is making you uncertain? This S5 has dual heads. One head has 21 days on it and the other has 12 days. I can write up a formal contract and notarize it if that will give you assurance. Also, if you consider that I work for a large international company and it would look pretty bad for us if I committed fraud, that might make you feel comfortable with this deal. Whatever the case, I'm happy to commit to a formal contract if you'd like.
Best,
-Kevin Burgess