While I acknowledge that it is possible that the employee might be ill or in the hospital or even dead, I question how important the property can be to her if she's gone 30 days without so much as even acknowledging that it's there. (I very much doubt that it's very important to her if she's dead.) While I don't think that 30 days is long enough for the employer to toss it, I do wonder how long the trolls upthread think they should hold it. 60 days? 90? 6 months? A year? 10 years?
Two things I am tired of typing: 1.) A wrongful termination does not mean that you were fired for something you didn't do; it means that you were fired for a reason prohibited by law. 2.) The above answer, whatever it is, assumes that no legally binding contract or CBA expressly says otherwise. If it does, the terms of the contract apply.