Can you inspect a government auction item before bidding?

Often yes. Most listings give an inspection window or a contact to book an appointment, and inspection is the only protection you get, because items sell as-is.

The rules are set by each seller. On GovDeals most sellers allow inspection by appointment during the listing; some do not. Federal items on military bases can need advance arrangements to get through the gate. Vehicle previews are usually visual only: on PropertyRoom you can look at a vehicle but cannot start it, drive it or read codes.

If you cannot inspect, price the lot as if the worst plausible version is what you will get: a non-runner you have to tow, or electronics that do not power on.