He said he didn't see why they couldn't do that as they were worried it would lock to a network they cant sell. He's going to speak to the manager and get back to me. I told him if it works he's got two sales but there's no way i'm buying it and returning it if it doesn't work because apparently they don't accept returns FULL STOP.
Stick the cash on the counter, they can have the cash once it is proven to work. If it's already locked then you take the cash back. Simples.