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Hello and welcome! My name is ***** ***** I will try my level best to help with your situation or get you to someone who can.
Can you tell me what state this is in?
Do you have records of when the tenant has paid rent in the past on time?
Are they still under a fixed term lease or has it expired and is now month to month?
Ok, then you don't necessarily have to have the written lease as your allegation is that they haven't paid rent when it was due. The tenant has to actually prove that they did pay when it was due.
You would just file the complaint and state that it was an oral month to month lease, not a written lease, since it has already expired, and that the tenant was behind $XXX dollars. When the written lease expired, the tenant became a month to month tenant under the same terms and conditions as the original lease.
You don't need to provide a copy of an expired lease and it is simpler to just state that it was an oral month to month lease contract. The tenant is unlikely to show anyway if they owe you that much and you should just get a default judgment for eviction.