I recently obtained a new passport in Bangkok, and I returned to my local office (Nakhon Sawan) to obtain a re-entry permit and have the extension stamp transferred. The IO told me I would need a photocopy of every page of my old passport and gave me a form to complete. Now, I was travelling the next day and didn't have time to do this, so I took both passports to the airport. I went through passport control (the one that doesn't have a re-entry permit desk) and was directed to an IO who took both passports and transferred the stamp there and then. "Thank you, sir!" He then directed me to the passport control area, where the re-entry desk is, and I duly purchased my permit. Excellent service from swampy staff.