FBA Prep guidance. Do I must pack products in a transparent poly bag?

Hello,

I was trying to send products (fabric bags) to FBA warehouse.

I saw that Prep Guidance.. and there are Prep guidance : ” Place product in a transparent poly bag to protect from damage or dust. Products can also be shirk-warpped. “

My product is already in a box as package. Do I have to pack products in a transparent poly bag again?

OR

Is it okay to send products (Box Package each product) to FBA warehouse?