I have cleaned my old files recently and found a ripple secret file. And the current price much higher than in 2013.
I finally found it back through a bit of work. And now I write it here for someone who has a similar experience with me.
I recalled that I registered an account at WCG (World Community Grid), joined the Ripple Labs Team, and ran BOINC client on my PC, then Ripple Labs sent me XRP depending on the points by the hash rate.