Honey,you'll need to announce it for a year or longer
Insignificant lost property has no value; if one announces it, there is nothing wrong with that, and if one consumes it, there is nothing wrong with that, and if one gives it in charity, there is nothing wrong with that, because it is insignificant and may not be worth announcing it. loose change,Ten, twenty or thirty , nowadays such lost property is not important, so if you give it in charity on behalf of its owner, there is nothing wrong with it, and if you use it there is nothing wrong with it, and if you leave it there is nothing wrong with it.
it is not stealing at all but if you knew the owner by a way or another then you should give it back to him.
and Allah knows the best.
http://islamqa.info/en/ref/5049
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