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I can do the case law research...however, this will take time (perhaps an hour or more)
I can send the offer if you are interested
Sorry...what does that mean? "release case"
Thank you for your question.
Please describe the situation a little more.
It is so well settled that an offer of a reward that can only be accepted by performance is often called a unilateral contract that it has not been easy to find a case that says that from the jurisdictions you mentioned. The classic case on this issue commonly taught in law schools is Carlill v Carbolic Smoke Ball Co  1 QB 256 Court of Appealposted at
The only US Supreme Court case I have located that discusses a reward offered by a government agency is posted at
but in that case the offer had been revoked prior to acceptance.
Please clarify what exactly you are looking for. It would help if I had more of the facts.
There are cases stating police cannot collect rewards when apprehending someone is already part of their job, but I really do not understand what context your question arises from.