At my brothers and he TOTALLY AGREES!!!! BE VERY CAREFUL. If these were duds and didn't fire back then they still may have active explosive ordnance in them!!!!!!! They would be very unstable due to age!!!!!!
You have RIFLE GRENADE THERE!!!!!!! BEEEEEEEE CAREFUL!!!!!!!!!!
You have parts of grenades
The first picture looks like a US GI Springfield 1903A3 five round stripper clips.
Can you clean up the piece in the 3rd picture - looks like there is some writing on the side of it! Could have been the tail fin section of a mortar.
Looks like the end carp of a mortar on pic 4.
The words WITHIN in bold were used for CAUTION this was possible a sign.
Picture 6 & 7 are for the Mark II Grenade - Picture is most likely the safety pin and 7 are the safety levers.