To be treated as abandoned you first should send a letter , demand letter that meets your states law for abandoned property and tell the person the amount of time your state allows to pass before the things can be treated as abandoned when you send the letter send more than one copy like one copy via certified mail and then a couple days later via confirmed mail delivery, WHY two ways , well if they claimed they didnt get notice from you before you disposed of the things and sued you then your bale to show a judge your postal reciepts along with a copy of the letter and they can explain to a judge how it was that the post office didnt deliver the confirmed delivery one yet the USPS says otherwise. If they refuse to sign for the certified one , it will be returned to you leave it un opened -sealed and in original envelope so your able to give it to the judge and the judge can ask them why they refused to pick up their mail ( and look like fools while explaining it to the judge) ( Your public library in your area should be able to help direct you where to find your states abandoned property laws or perhaps your states attorney generals office links may have the information.