Same situation happened here.I bought the same thing from this seller and it turned out to be a tamagotchi with v4 shell but v4.5 gameplay.Anyway,I am glad that I own something special!haha:-D
Oh!This post helps me out a lot as I plan to change my familitchi buttons since they are not working anymore after I left it in my garage for years.haha! Gonna make it alive again!!!HOHO!=D