How do I know if my NEX-5n is unused?

Hello guys,

I've got my NEX-5NK/B couple of days ago from ebay seller (gwcameras). It was a deal NEX-5N body + 18-55mm for 444 euros. It was an open box because SEL16 was taken out of the box. It was also stated that items are brand new.

But when I open the box I realized that there was no original sony film protector on the screen. I took the photos and checked their file number, it starts from 000. On youtube unboxing videos of NEX-5n show it with sony film protector. So I just want to know if you have the same experience as me?

Don't take a picture, create!