1883 Is an excellent AU58. I think it just had a little pocket time but I would take it over an MS61 any day. I just think I can make out a little light rubbing on the high points. If it is a weak strike you may have a MS65 W/O cents nickel.
The Type 1 1913 Buffalo looks to be an XF45 at best to me. That horn is full but surely flattened some.
Little wear on the ribbon and cheek. Good eye appeal on both, nice picks.

Congrats on the recent acquisitions.