I am sorry to learn of this situation.
While AZ Statute 33-1321E does require a landlord to provide an itemized list of damages within 14 days, this statute is limited to the landlord's right to make a claim against the tenant's security deposit (the landlord's quick remedy for damages). It does not restrict or otherwise limit the landlord from pursuing a tenant for damages under either breach of contract, negligence, or damage to property theories of recovery.
You state that you had no security deposit, so this code section does not apply.
However, the landlord appears to have improperly pursued the matter - instead of sending you an invoice for damages (which you would have had the opportunity to contest), they simply sent the matter to collections. Valid reasons for doing so would be very limited - perhaps not providing them with a forwarding address.
Even though the landlord has sent the matter to collections, you can still contest the amount owed (you even have a right to sue them in small claims court for "declaratory relief" - the claim is a breach of contract theory, but you are asking the court to issue a judgment to determine how much, if anything, is owed).