Help. Tenant surrendering keys but leaving items behind

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Hey all, First off I am in New York I have a tenant who broke up with her boyfriend. They both are on the month to month lease . The boyfriend has moved to another state and she is the only remaining tenant in the area. She has taken everything of hers from the property and he has taken most of his things . She is surrendering the keys to me tomorrow and also signing a form stating she and he are surrendering the apartment . The concern I have is that he will not be available to sign and they left some clothes and other random low value items behind. Does anyone know if this is a major concern ? Do I have to house the items or am I not even supposed to do anything and serve a formal eviction ? Any insight would help .