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A person cannot accept an offer without knowing about it. That is because any action taken would not have been a response to the offer. Thus, an offer of a reward that is made to certain persons or even to the general public cannot be accepted by someone who has never seen or heard of the offer. In such cases, the offerer may get what was sought, but most courts require that anyone who claims the prize must have known of the offer and acted in response to it when performing the requested act.
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What are the requirements of an offer?
The offer can be accepted by someone who has only heard of it.
The offer can be accepted by someone who has never seen it.
The offer can be accepted by someone who has never heard of it.
The offer can be accepted by someone who has seen or heard of it.