You got a good deal on the coin but it's not worth slabbing even if the toning is original. I have a few toners myself and based on your lighting angle it's not as pleasing straight on, and that's the norm for toned silver eagles. If the toning is natural and increases the eye appeal straight on, then it's worth a premium. The value of two Morgan Dollars is more than the value of this coin, so don't know how you will make such a trade. Two Morgans even have more silver content than this one SAE.