I cant ever recall seeing a fake E145-2 with the back upside down.
I know someone can make a homemade fake like this, but all the doctored reprints Ive seen have the back NOT upside down.
Cards in condition like the 2 you pictured are common, missing corners and dirt. and they are the easiest to tell if the back is upside down too
Dont know about the thickness variations though, I do know that E145-1 are slightly thinner than E145-2