I grabbed the Sylphin Fission Blade (better ARP bonus for Steam Quest completions than the H`erkow Warrior Script when upgraded) & 10 Fragments from the shop, immediately upgraded the blade to Mk3.
Odd thing is it wouldn't let me switch to it (seems the site thinks I recently changed my artifacts, which I don't remember doing).
I'll have to try again tomorrow, I guess...

I located this thread some time ago when I was researching AWA artifact perks.
It's a useful tool in determining functional artifacts for ARP boosts.
I'm leaving it here so I don't lose it again (having to go through my browser history to find it again) & so others who didn't know about it can also benefit from it:
(see comments for URL, link not working correct in post)

Managed to grab a key for SWORN this month (1st success). Seems your best bet to get something from the Game Vault is: 1.
Decide what you want ahead of time. 2.
Figure out when it unlocks in your time zone. 3.
Make sure you access the page at the opening minute. 4.
Wait out loading of the page rather than refreshing.
The site will be overloaded by everybody accessing it at the same time. 5.
While waiting for the page to load...pray that there's still a key left by the time the page actually loads...

There's an issue that appears to be caused by a change in standard privacy settings on Steam, where now you have to be logged in to see a user's Library (owned games).
This means that it is unlikely that this site will be able to verify owned games (unless it's logged into an account while looking at game libraries; most bots don't work this way).
It should still be able to pull game information if you've recently played it (meaning it will show on the home page of your profile publicly).