have a sniff around
have a (good) sniff around
To investigate or examine a place or area for more information. Please tell me that the cops won't find any incriminating evidence if they have a sniff around your office.
have a (good) ˌsniff aˈroundexamine a place carefully: Come and visit our website and have a sniff around!
This refers to the way that a dog sniffs (= smells) something in order to find out more about it.