Also, tomorrow is a Monday and the 2nd to last day for the Covid unable to travel extensions so expect immigration to be packed. I'd recommend you get there atleast 90 mintues before they open and que up.
No idea, but if you're arriving you won't be able to get to them. If you're already in Bangkok, there are 7 other Superrich locations in the city that give the same exchange rate.
Lol, contrary to popular belief, all checked luggage is looked it with an xray by customs before it comes out on the belt. If they see something suspicious in it, they'll tag it and wait to see who collects it, then have them open it on inspection.
Anytime I bring in a cardboard box, they always stop me and check it. Suitcases only once.