Rats

Does anyone have any experience. Here was my situation. Customer called said there drywall was getting chewed thought maybe squirrel or chipmunk. Went and did an estimate etc. didn't think it was squirrel or chipmunk never have seen one chew through drywall. Set two small box traps caught a rat next day. My question is should I leave set for few days. are there usually more than one? Also no obvious entry or exit home is actually sealed up well so no obvious exclusion .

I'd bet money there's more, I'd also put a few more observation sets in with a cam and tracking powder. Rat entries can be hard to find, you wont necessarily have an obvious entry/exit. jmo