Advice on Storing/Displaying WWII Squadron Patches

[Colonel Sanders]

I finally was able to purchase/find some display cases (while keeping all my patches in Ziploc's inside an Amazon box throughout college ) and was looking for some advice on preserving my patches.

 

So my questions are:

1) Should I be treating these with anything?

2) I have 2 different displays; one has foam as the background and the other has cloth. Can any of these cause any sort of deterioration?

3) In my knife display I placed silica packets inside to reduce moisture; would it be a good idea here as well?

 

Thanks!

 

Foam displays:

[Colonel Sanders]

Cloth displays: