Obviously there is a way if it happened.....

Do you have any parties who would be aware of your business dealings with your tenants?  Is your business incorporated?

I would suggest that the tenant contact the CRA and get the name of the furnisher of the information.

If the CRA wont do it informally, then he/she can file a formal request for the info under FCRA 609(a)(1).

That would solve at least that part of the mystery.......