Hello, I am a big tupac fan and have considered buying an autograph from him. I am not familiar with the authenticity of autographs and wanted to ask if anyone can help me here? I found 3 autographs online for sale:

1#

2#

In the seller's description it said:

Authenticated Tupac Shakur / 2pac signed mounted autograph with COA

Signed in Oakland circa 1992 by 2pac himself for a fan whilst on the movie set of Poetic Justice, I picked up this gem on holiday in America in 2002 from an autograph outlet in California.

I’ve never taken the photo out since I got it framed or even touched it therefore it’s in immaculate condition, I just don’t have room for it anymore and would like to pass on this to someone else who will appreciate it as much as me.

This will be sent signed for recorded delivery (1st class) free of charge and tracking number will be provided.

3#

I also found an autograph of Tupac from his mother, which I am considering buying. 

The seller Jeff says He was at a book event 
where Afeni Shakur gave him the autograph