[Buythatcard]

I am hoping to get get some advice on this.

A family friend recently lost her Father-In-Law. She discovered that her Father-In-Law had some baseball cards stashed away. Since she knew that I was in the business, she asked me to help her out.

He had a stash of T205's & T206's. There were some Cobbs, Speaker, W. Johnson, etc. One problem. They were all glued to some sort of backing.
She sent me pictures of what she has. They look legit from what I can see but I am not 100% sure.

Here is where I need help. First of all, do these cards all look legit to you. Secondly, what would be the safest way to remove the backing.
I have soaked cards before several years ago and it all worked out well. But they were all commons. I am a little bit nervous about these, so I don't want to mess it up.

One of the photos show all the cards. The bottom row appear to have some printer copies of cards.