The mother of missing Ben Needham says the Prime Minister has refused to give her son's case the same financial backing as the McCann family.
Last month Kerry's MP Angela Smith asked David Cameron whether the Needhams could get similar funds as those given to the McCanns in the search for their daughter, Madeline.
But in a written reply David Cameron says the National Crime Agency has supported South Yorkshire police, but made no mention of extra money for the Needham case.
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The rheas, named Sally and Harry by staff looking after them at a farm in Haxey, were both found in the Sprotborough area.
It comes after months of protests following United Lincolnshire Hospitals NHS Trust's (ULHT) decision to close the unit overnight.
It will be available to see at William Wilberforce's birthplace, Wilberforce House Museum, throughout Hull's tenure as UK City of Culture.