It functionally doesn't matter. You only track material components when they indicate that they have a cost. If they have a cost and they are consumed, it is indicated in the spell description. If they do not have a cost, and it doesn't say they are consumed, they do not seem to be consumed (though this makes very little sense when you think about it). It may be better to leave this up to the player's imagination whether or not they are consumed (again, because it really doesn't matter when you have access to a component pouch).
The important part here is that M spells without a cost are indicating a free hand is required to cast (M and S spells can use the same hand, but both require a free hand). The descriptions of these items are almost entirely for both historical and flavor purposes. They are considered to be present in your spell pouch in sufficient quantities that you have no trouble casting the spells when you want to.
Whether or not they can be recovered or are used up is left entirely up to you in these cases.