I commend you for going about the search correctly. It seems that most people locate a good name match, declare "I've found him" and move on from there. You have made each possible match a candidate rather than an instant winner. The young telegraph operator from Franklin County can be marked off your list.

I neglected to explain that the SG codes mentioned earlier are for containers. It's a box code that tells the archives which one they should bring to you. When it arrives on a cart, you can look through lots of other papers that you didn't specifically request.