Not sure about the value of the pellets or tins, Mac, but the red and yellow BSA pylarms tin stands out for me as one that may have some value as I think it's prewar - and perhaps could fetch £15 or more on the auction site alone.
Would it be worth listing the tins with an estimate of the number of pellets in each so a potential buyer could easily get a total for the different calibres?
None of the other boxes or tins look particularly valuable to me, but I'm no expert on the subject.