What do I need to know about the 90-day reporting process for DTV visas in Chiang Mai?

I’m living in Chiang Mai with my wife and our four children, all on DTVs. 90 days for us is next Thursday. Online isn’t available for the first report, and I opted to try in-person to see if it was as easy as I had been told. It was. I asked another expat for advice and was told to take passports, TM30s, and completed TM47s. I also took a print-out of our house lease agreement but wasn’t asked to show it. I didn’t take passport photocopies. I got to the drive-up window not long before 1:00; it was closed for lunch between 12 and 1. Several minutes later the window opened, and I gave the officer the stack of six passports (with TM47s loose and TM30s attached inside each one). It took him about three minutes to process all six of them and issue printed receipts. Please note that this is my experience in Chiang Mai today; no guarantee that this will work exactly the same in other places or at a later date. Also: our passports are stamped through Feb. 19, but, because I went in a week early for 90-day reporting (you can do it between 15 days before and 7 after the 90-day mark), the receipts show that we need to report again 90 days from today (Feb. 11), not 90 days from the 90th day (Feb. 19). So, if one wants to schedule a 180-day border bounce very close to a visa stamp date, don't report ahead of the 90-day date like I did unless you want to report twice before leaving the country.