I know, I was late to the party, really late.. but I'm here now! My first linus video was
I know, i know. I had already gathered some knowledge on PC building before i got into linus but I've been watching ever since i came across the channel.
Also,
If you're on youtube.com go to the right hand side of your screen, and click your channel, you should find this tab
https://gyazo.com/9c6a391508f2fa2e67bff882000a78b9
Next, you go to the left hand side of your screen and click history
https://gyazo.com/50b800a3509fb99edc5857467e041652
There you can search "linus" and find your video, not sure if it holds the earliest record, but that's how i found mine, although i only started watching earlier this year.