NY Tenant disappeared with most belongings left behind

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I had a tenant here in New York who disappeared early last February without a trace and left almost all her belongings behind.  I could not reach her, and eventually her phone got disconnected.  About a month later, in early March, I reported her missing to the local police.  I have a strong suspicion she is dead.  She often traveled via hitchhiking.  I still have all her belongings stored away in a few boxes.  How long is long enough to wait to dispose of her belongings?  NY laws just seem to indicate waiting a "reasonable" amount of time.  I think a year, especially given her risky behavior and the strong likelihood that she's dead, is more than enough.  Thoughts?