Surely the immigration computer would spit out the names/address of foreigners overstaying their visa as soon as it expires. Why does it take so long to catch them?
Don't 3BB give you a decent wifi 6 router with their package. Connect with a decent CAT 6 cable to your PC. I never get a full 1 gbps but consistently 940 mbps. Best wifi to my phone is about 400 mbps.
I have never had any problems at Jomtien immigration. Whether it's 90 day report, or visa extension or residence certificate i never wait for more than 20 minutes and the staff are polite and efficient.
Actually shipping costs here are very low, often free through Lazada. But i think many are subsidised by the CCP. If we had to pay full delivery costs maybe not so keen.