I'm working on creating a tool to provide machine-readable data concerning the contents of packs in Yugioh, and I noticed nobody on the internet had pack odds for the first McDonalds promotional pack (aka MP1). So I took matters into my own hands and turned to YouTube pack opening videos, where I watched and recorded pulls.
These packs are rarely opened, as they are a bit rare, but I found a sample size of 269 packs. Not great, but could be worse. MP1 packs are two cards, the first always being a common. The second card was a common in 194 packs, a super rare in 46, an ultra rare in 28, and one pack, curiously enough, only contained 1 card.
Of all the videos I found, I excluded only one, on the basis that it pulled all of the supers in order and then all of the ultras in order, making me suspicious; not going to name names, but I think someone's been rigging their pack opening videos.
Anyways, this gives me roughly odds for the second card of:
1:10 UR
1:6 SR
Else common
which is now reflected in YJViewer, as per the screenshot above. Hope putting this out here publicly helps someone in the future like it helped me!