Bench testing a Concert headunit

Mr pee

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Hi guys, not been on hear for a while as I sold my TT over three years ago.
When I owned the car I swapped the headunit for a Chinese all singing dancing one (big mistake) anyway it went wrong so put the old Concert one back in while I decided what to go for.
It powered up fine and never asked for a code, so I then went for a Pioneer which was great and left it in the car when I sold it.

I know want to sell the unit but while searching around it seems if it goes in another car it will need the code, I have found a place to get the code but would be happier if I could bench test it with the code they send me before I actually sell it to make sure the code is fine and that it still works any one got any idea on how to do this.