Good morning.
I have renewed my passport while in Thailand in march this year. Elite visa and arrival stamps have been transferred into the new passport.
I'm leaving Thailand for the first time with the new passport, flying from BKK.
Any chance an IO wants to see the old passport as well when I leave next week and when I come back next month ?
TLDR : Answer Summary
After renewing your passport and transferring your Elite visa and arrival stamps to the new passport, you typically will not need to present your old passport when exiting or re-entering Thailand. The new passport will contain a note indicating the transfer of your visa and stamps, making the old passport unnecessary. However, it may be wise to carry the old passport with you just in case, as some travelers have encountered requests for their previous passports at immigration.