This link contains an interesting video (scroll down a little to find it) about bombing up a Wellington bomber.
At the 16:28 mark it shows a Small Bomb Container being loaded up.
At about the 18:40 mark they roll the container over so you can see the top of the container. You can compare it to the posted photos.
https://stephentaylorhistorian.com/2...uctional-film/
The same video is also here:
https://www.youtube.com/watch?v=zHFBTWN6tDQ