The mother of the 6-year-old boy once feared missing inside a runaway helium balloon told Colorado sheriff's deputies that the whole saga was a hoax, according to court documents.

Mayumi Heene admitted to deputies that she and her husband Richard "knew all along that Falcon was hiding in the residence" in Fort Collins, according to an affidavit used to get a search warrant for the home.

She allegedly told investigators the incident was a hoax meant to make them more marketable to the media.