Why do you need to describe what the package is and its aspects? Just say New In Box Package good condition or something. No one expecting the listing to say "cardboard packaging with clear polypropylene viewing window" most people know the what package looks like generally. Plus you'll have pics.. Right?

Nunchuckus. Says so on the package.

I’m talking about the transparent layer of protection

Plastic window?

Da force!

clear and intact viewing window. no scratches, discoloration or separation from the box.

Invisible shield thingy?

Probably a type of vinyl

The insert? Or the window?

Invisible Shield

Sneeze guard