Yes, in a fraudstopper bag which I have a video of me loading up
why will some one sell you $570 worth of bitcoin for $450 worth of TWD ?
Because he thinks he might or can get away with it.
On a side note, use escrow here. Don't send bitcoins upfront on the strength of that video alone. NTD notes might be counterfeit or shipping might be reversed or cancelled once coins are sent. A fraudstopper bag alone offers zero protection.