But pronunciation is the same in both instances. So the observation that some
do not know the difference is only relevant to written English not in spoken English, which is the subject of this thread.
Worst case scenario.
30% of the landed cost (value of the item plus shipping cost, post, courier)
Plus 7%
Even worse case.
Add 200 baht for FedEx handling fee.
Sadly in this day and age and maybe long before we are afflicted by the phenomena of "not my job". This is universal but seems to also afflict Thailand to a large extent.