The silver skins should be emptied every time you install a new coffee air filter. Here's a quick video on how to replace the air filter.
Be sure the machine is cool and unplugged before you proceed. The air filter is located in the compartment on the right side of the machine. Gently push the round shallow indent on top of the compartment to spring open. Remove the outer cover and set it aside. Take out the black air filter enclosure box, remove the lid from the back, flip up the small metal clips and remove the old filter and replace with a new one. Discard or recycle your old filter as local laws allow.
To empty silver skins (aka Chaff), hold the filter enclosure over a rubbish bin, remove the metal mesh chamber and empty out the skins. Replace the metal chamber and return it to the air filter enclosure.