I've only watched the first few minutes and already seen some excellent container photos, particularly the early 'silver' (unpainted alloy) Bells. For example, from around 4:55 there are some good shots of the flush-sided type which I represented with a simple repaint of one of your boxes, top left here:
In the early days of Bell, there were several subsidiaries including Bell Ferry and Bell Lines, and some of the early containers were lettered as such. I chose a Bell Ferry example that I found a photo of in Ireland; some of the photos in that youtube link show the Bell Lines equivalent.
Nice to see some good photos of some of the sheet and post alloy types used by Bell in the early days too.
Most of the images do seem to be in the Netherlands.