2011 ford escape Rear panel rusting?

I'm buying a ford escape from a private seller, ill be visiting the seller to inspect the car next week. After looking at pictures and talking to the seller, the car APPEARS to be in good condition with exception of the rear passenger side panel that is showing rust, what else should i look for when i visit that might be of concern with regards to the rust?

Look for repaired collision damage. Wavy sheet metal. Paint color may be off. Surface rust is an indication that the part was not painted properly. Check to see if there's rust through.

A 7-year-old car doesn't just start rusting for no good reason, Skippy. I would suspect poorly repaired accident damage

Look underneath the whole car to see how rusty it is.