Not an expert on booster packs, so best wait for some of the pros to respond, but:
No, I’ve never heard of some 1st edition cards in an UED pack. There are some 1st edition Base Set packs with UED cards in them, which are basically Base Set triangle-stamped packs where they forgot to add the triangle.
I’ve never seen an UED pack contain 1st edition cards, though.
They don’t look alarming to me, but again I’m not very knowledgeable when it comes to booster packs and boxes. But wrinkles like that seem like a normal thing that can happen during the sealing process to me. Looking at the pictures here in the variant 3 a similar wrinkle can be found.
No idea…
Again, I know next to nothing about booster packs/boxes, but I personally don’t see anything too alarming about them. But again, let’s wait for what others have to say before making any conclusions.
Greetz,
Quuador