I noticed there are two very small holes on both blades on my new fork. They are on the inner side of the blades at the end of the fork blade just above wheel axis mounting point. They are apparently designed to put there because they are at the same position and holes are smooth and no damage. So what the purpose of these holes? I noticed that my old fork also got similar holes, which I never noticed before.
On steel forks the tiny holes at the bottom end of the fork-blade are vent holes for the brazing process. The brazing produces fumes the fumes and the heat expands the air in the blade which makes that these holes are needed to evacuate both. On steel frames you may find similar holes in the seat-stays and in the chain-stays where they are usually close to rear drop-outs. If you're worried about rusting because of moisture that could go inside spray some wax-coating or tar-based antirust inside, or a periodic jet of penetrating oil as I do.
These are moisture drain holes. Moisture can condense and build up inside frames and cause rusting (in steel frames) or delamination (in carbon fiber).
The drain holes allow for the built up moisture to drip off.
Some bikes have that kind of thing to use a, kind of, washer with two tabs that locate the fork better. Not seen it on many recent bikes though. I think it's only on Non quick release type axles too.