New,
In my opinion, cutlery, like firearms, should be left in the present condition. Efforts to try to improve them may lead to loss of value. For instance there is a Pattern 1796 on Ebay at this time, asking $500, and no bids yet. The problem is that Bubba has been trying to improve it. The blade has been polished, and the original clipped point has been rounded off. Though it looks fine, I would rather have yours in the original condition it is in. There's not much really that you can do to restore it. If there are any sword collectors on the forum they may have some suggestions. Finding an original scabbard may be one option, but I think the chances of finding one would be very slim indeed. You could buy the one on Ebay for the asking price and that would give you a scabbard but.........