Yes. Samut prakan - they want it. Just bring along copies of: landlord ID, Landlord Blue book, lease agreement, your passport + the last tm30 slip (if you have it). I done mine with these.
The usual documents (birth cert, child tabien ban, wife id + tabien ban, tm30, passport + copies) worked. Got my extension received in good order. Good luck mate
Oh ya. As for the tabien ban, we got the "certified original certificate" from the nearest district office. Go in with the Thai birth certificate/ID card, and you can get it. Its acceptable.
I am currently at Samut Prakan immigration. Will share some info once i am done. Doin the TM30 and extension based on thai child. It may take a while tho