Mike Dee
Ambassador
I remember a similar offer last year (I forget by whom), but it turned out they wanted to falsely inflate their Amazon sales figures by sending money to my PayPal account and then having me "purchase" the case on Amazon, instead of simply sending me a free case. I declined to participate. I have no idea whether this offer is similar.
Many vendors store their inventory on Amazon so that is where it is shipped from. When its a free promotion you sometimes pay for it up front and get reimbursed or are sent promo codes to order.