William my man...
You will see what you can do? It´s been clearly stated what you can do and should do in order to keep your name clear. No need for you to come up with any new solutions. If you´re legit as you claim...I can´t see any reason NOT to do the right thing, it was £115 right? For me, a pretty small amount to "set at risk" if you plan to list more items here or on other forums further on.
Note that I´m not trying to hang you out at all, I´m just trying to explain how simple this could be solved with the result of everyone being happy. Also a pretty cheap way for you to get this thing out of the way, don´t you think?
Check this out,
1. Transfer the payment back to Steve. Do it now
2. Contact your post-office, check where that package is and why it haven´t been delivered.
3. Wait.........
If or when the figures arrive at Steve´s place he will re-send you the payment AND......... I will personally gift you £40. If the figures are lost, gone and never to be found, you have paid a veeeeeery small amount to keep your name clean + made future sales a whole lot easier.
40 quid extra on top of the original £115, sounds pretty good right?