@Ryanyolly ***************
I hope you mean you were on an "extension of stay" from an NOn-Imm visa because IF you had a visa from a thai consulate in another country (not an extension from inside the country) you lost it ๐
You take the police report and any documentation from the embassy that they replaced a lost passport to the immigration office where you got the extension and they will look up your information and transfer the stamps to the new passport
IF you're on a Non-Imm extension you go to Chaengwattana to get the stamps