在27315_2.1的vocadb讨论区里BranzBerryz提到的回复里面描述了这几首歌曲的来源：
@Mikuo_Leeksune002
To provide the full story:
Someone named Aiku gave Yuki 4 0k songs that were deemed to be previously lost with the only condition to not reprint them out of respect for the artist.
He complied and only gave it out to a few trusted people privately. One trusted user on the other hand ended up sharing it out to another sever which lead to somebody else reprinting it. Upon hearing this, they tried to take it down but to no avail. As a result, Yuki reprinted all 4 of them (along with a couple unrelated songs) out of retaliation and anger.
They later announced on the server that because of this incident, nobody's ever allowed to get their hands on privately archived songs from Yuki or other staff members again. The reason? People can't be trusted anymore.While i'm at it, I'll admit this right now to avoid any accusations: Yes, I had a 0k song (specifically 7.1), but I had 0 intentions of sharing/reprinting it to others. I promised to Yuki and Morian (Another mod iirc) that it would stay safe with me; considering Morian was able to trust me with this song, I didn't want to break that promise. So no, I'm not the person that's responsible for this incident.
I have no clue who it was or if they have been identified, but shame on them for ruining it for everyone.
大体就是说有一个叫Aiku的人给了Yuki这几首歌，但是要求不得发布，结果传传传传出去了，于是Yuki愤怒的将这些歌和另外一些歌发布了，并且说明以后别想从TA那里拿到歌曲了
另外一个youtube视频的简介里面也说这些歌曲是被泄露的
因此我觉得这个说法是可信的？如果大家觉得可以的话我改一下qwq