I can't speak for all clerks, but I'm not necessarily bound to a "success percentage" of worked packages. Instead, the P&D manager wants to know if I have any more than 10 service exceptions on any given day. Being that I work in a colocation and my side(HD) services about 3,000 boxes a day, this is roughly .0035%. The beauty of it all is that you can't always get the answers; not everyone is listed, shippers sometimes can't/won't supply phone numbers, and customers don't always respond to post cards in a timely and/or correct manner. It's all an honor system for the clerk which is intended to be tested regularly by station management with periodic audits of all waiting packages in the QA cage.
Also, the clerk does have access to the information you put in the scanner when you scan an 02/03. The HD side runs a report in the morning called the preliminary qa report; and it details all 02/03 and 06 scans from the previous day. This allows the clerk to work the packages before the driver even shows up at the station in the morning. Ground drivers, for the most part, come back at night so all their lookups are stripped from the trucks and sent to the cage for the clerk to work in the morning.
It sounds like the clerk in your station needs a lesson in deductive logic. If you tell her that the street number is an issue, then obviously a map is not going to help. The best solution is to try and contact the consignee, confirm or correct the address number, and get the details for the location. Where is the street number posted, what color/style of house, landmarks, unique features, etc. All this information is put into our cardfile computer so it can be easily recalled for any future deliveries to the same location.