Just a note letting members know I found new uses for the US Embassy notarized marriage affidavit.
Seemed like such a waste - $50 for an embassy notary stamp when my county clerk back home will notarize for $5, and translation and legalization only came to $20. And then the nice lady at the amphur did the deed for us in under 45 minutes, walk-in, no waiting, no witnesses required and no translator, and gave us two lovely certificates suitable for framing for just 20 baht.
Anyway, about those uses. The paper has your name, your passport number and your residence, with an embassy seal.
Bangkok Bank Silom accepted the single affidavit, made a copy, returned the original to open multiple bank accounts.
The amphur lady scanned the legalized affidavit into the system, and returned the original.
DLT at Mochit accepted the single affidavit in lieu of a residence certificate and/or embassy residence affidavit. They retained the orginal (+copy for motorcycle), so drivers licenses were applied for after the hitching.
YMMV