💡 Detailed Explanation
The man wants to dispose of an electronic piano. The staff member explains that since it's still working, he can post a notice to give it away (reuse). To do this, he needs to submit a form along with the piano's model number, manufacturing year, and a photo. The man realizes he doesn't have this information with him and says he needs to go home to check it. Therefore, the first thing he will do is go home to check the piano's information and take a picture of it.