The other day I asked if someone had the "we are the champions" short video and I searched here
https://hololivevideos.download/channel/hosimatisuisei?__cf_chl_managed_tk__=pmd_4b3c0bd4c11d3e71850f7c82fc216f808b0eaf49-1628712558-0-gqNtZGzNAvijcnBszQbi for the video but the page was down, now it's up again. I recommend someone to download what you can from there. I would do it myself but I don't have enough space or download speed to do it.
The "we are the champions" shirt videos isn't there though. I'm still searching for it 