Someone already sent me $300 USD and I refunded it as soon as he asked.
If i was going to scam I would have kept it and left.
The problem is what you're saying, you haven't realized, probably, but something you said prove you don't know how what a S5 is/how it work. I also made you an offer you at which you never replied and also gave you an alternative.
Would be pretty easy for you to take a pic of your miner next to a piece of paper with my forum name + your forum name + date on it and show it here if you're legit.
If you really think if they take a picture with there forum name with the miner, then you have something coming for you, Still even if he gets that photo, use escrow.