Why not put in a plastic ziploc bag? Lots of stuff from Amazon comes in plastic bags. I got a pack of 2x3" recently, that size would be perfect for this. I bet

Why not put in a plastic ziploc bag? Lots of stuff from Amazon comes in plastic bags. I got a pack of 2x3" recently, that size would be perfect for this. I bet it is enough not to move around in the envelope. I guess there are anti-static bags if paranoid.