What should I expect during the investigation for my Thai wife extension?

The user is undergoing a Thai wife extension for their visa, which is currently marked as "under investigation" until May 16th. The conversation reveals that this is a common scenario where the immigration officers may conduct a house visit to verify the marriage status, talk to neighbors, and take necessary pictures. Replies indicate that this process is often friendly and relaxed, with emphasis on being prepared for possible short-notice inspections. Experiences shared suggest that while it may seem concerning, it's typically a routine procedure, and many users have reported a smooth experience.