Found these at the local antique mall today while shopping with my wife. Couldn’t verify authenticity on the spot but fairly certain the helmet is repro and potentially the zeltbahn, but for the prices I couldn’t resist!
Zeltbahn is a post war Bundesgrenzschutz/West German Borderguards, the M40 stahlhelm's shell looks fine, liner+chinstrap are post war police, the decals look fake, the helmet was probably a WW2 made reissue post ww2.