I'm always like your interesting projectiles!
Maybe have an old WW2 German test shooting range in your garden??
1 a normal pzgr but ith cap, maybe for captured cz guns?!?
#4 is the first model of APHE-T as it was used on the 3,7cm Pak. Here likely an inert TP-T version.
Have you any more information on No. 4 please?
For example when it was in use and any pictures or diagrams.
Thank you.
PC