The 3 Morgans look to be G-VG. Can't tell if the 1900 is the O/CC photo is not close enough. Numismedia.com, price ranges from $35-$80.
I don't know much about the seated halves as I don't collect them. However, it looks to be AU as I can see some wear on both sides, could be around $180-$420. You'll have to wait for someone who collects the gold as I don't.
Touché! I was thinking the same thing! Wow! Awesome finds! I cannot find any wear on that half. It might grade higher than AU? My advice? Sell the coins and use the money to buy a better camera to takes pics with! You're making me go blind with the crappy pics and why'd you leave them in the holder? Take them out and lay them on top of the holder, so the label reads what they are but the plastic doesn't get in our way! Duh! Ribbit
The 1858-O half is a beauty. I would grade it AU-58 and put the value at about $400 to be safe, but what i am seeing as wear just may be the result of a weak strike. This is important because if it is only a slight strike weakness, the value would triple. Great find, congrats.
Maybe it's just me, but I would contact the previous owners of the house to see if they left them there by mistake. I can see forgetting a few silver dollars, but a $2.5 gold Indian?