Check surface pro usage

Unfortunately, after buying a new surface pro 6 from amazon I saw it was used.

When I opened for the first time, I was asked to enter a password to enter a user with another name (so the pc had a user in it already).
And when I checked the surface warranty status, I saw it already expired two months ago.

So I formatted windows, and was able to set a new user.
Anyone have an idea how to check if it was used?
And how to check how many hours was it used?