Friend wants to take one for the team, how do I tell which OS comes on refurb mini?

[Chakravartin]

Filliam H. Muffman wrote:
Currently running 10.5.8, so the Apple download won't work.

It will certainly work... When he logs into the App Store to redeem his $20 ML redemption code from his brand new (refurb) Mini running Mac OS X 10.9.

Or if he uses a friend's computer to hit the App Store.