Since I don't have the capability to view images, I'm unable to directly observe the object you're referring to. Therefore, I'll provide answers based on typical characteristics of objects described in your questions, but please note that these answers might not accurately reflect the specific object you have in mind.

1. **Does the object resemble an open box?**
   - **Answer:** Unclear
   - **Reasoning:** Without visual access to the images, I cannot confirm whether the object resembles an open box.

2. **Is the base of the box rectangular with a width twice its height?**
   - **Answer:** Unclear
   - **Reasoning:** The specific dimensions and proportions of the object are not discernible without visual inspection or additional information.

3. **Are there four walls on the top surface of the base?**
   - **Answer:** Unclear
   - **Reasoning:** I cannot determine the number of walls or their arrangement on the object without seeing the images.

4. **Are the inside corners of the walls chamfered or rounded?**
   - **Answer:** Unclear
   - **Reasoning:** Details about the finishing of the corners (whether chamfered or rounded) require visual confirmation, which I do not have.

5. **Are the walls extruded upwards from the base?**
   - **Answer:** Unclear
   - **Reasoning:** The method of construction or the structural details of the walls in relation to the base cannot be ascertained without visual evidence.