I have a HOU machine. I checked and could find these plastics installed any where on the pf. I also have NOS plastic set a bought 10 years ago and those plastics are in the set. They are probably pieces that where removed from the production model. The scanner hole is the hole on the left side of pf. The salt creature doesn't appear anywhere on the pf. I wish I could of been more help.

the Clear Piece goes on Top of the Ramp "behind" the vertical Playfield Backboard....

I have a DE ST as well, I don't have the salt creature on mine either.

Both the salt creature and the collect scanner value, go on the ramp where the "red" collect scanner sticker is at. The salt creature goes on top with the lamp through it.

Hope that helps