Welcome to the group!
These days finding that fairly rare rifle new in box with all original stuff is extremely rare. My feeling is $1200 is very reasonable for a collectible SA93.
That said, remember I said "collectible" meaning that do not change anything on that rifle that causes you to modify the original and not be able to return it to original as delivered. Any modifications (debanning) that cannot be undone will hurt your $1200 investment. As a collector I have to tell you that I have turned down some very rare rifles because the previous owner didn't understand the collectible value of these banned AK variants.
On the other hand, it would be your rifle and if you really don't care about us collectors ( ) you have the right to modify as desired within the law.