British ww2, 3" + 2" ammo boxes

[Panzerknacker]

Hi, i bought 3 british ww2 ammo boxes this year at a carboot and id them as british 2" x2 and a 3" & piat used the same steel box and was wondering = How much are 3" inch and 2" inch mortor tins worth nowerdays ? pictures attached the 3" inch is the worst condition but is just slight surface rust, picture attached of 3" or piat box, any help appriciated thanks