[handy man88]

These look like aluminum to me.

 

[handy man88]

Any suggestions on how I can remove them and then put them back?

That soffit vent is probably nailed to the fascia.

In order to acces it, you probably need to somehow bend that lip on the fascia board cover.

If that does not work, what you can do is just cut out that soffit vent, remove the insulation, and then replace with another soffit vent that you could probably buy at HD and cut to size somehow.