I'm surprised they couldn't access the warranty information right from their files, or at least on the manufacturer's website.
If it were a computer, I wouldn't hold out any hope for you. Most computer warranties are only a year long. But there is no reason a power supply shouldn't last long, so you may be okay.
If not, power supplies shouldn't cost all that much anyway.
I know you're feeling withdrawal pangs, so I hope it's all resolved very quickly!