in a suitcase with a friend when they visit.
otherwise expect to be taxed on the items NEW value
$600 is 22,000 baht not 2,200
the stuff you mention it simply does not seem worth the hassle or expense
any data on hard drives can be downloaded directly if you get someone to connect the drives
try https://toffeeshare.com/
what are the items you cannot find here?
as mic, monitor and HDDs are available everywhere and those are all you specifically mentioned
and those are what do not seem worth the hassle
if you do ship, be sure to include an invoice for every item