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This year's Christmas card includes extra layers for those who want to challenge themselves further, with additional elements hidden within the code.

It's also unclear exactly where he was hiding in the days after he left New York.

But they are only copies, with the originals still hidden away, this time under the watchful eyes of federal authorities until a court approves their new ownership and an auction likely determines their monetary value.

A recent Court of Appeal ruling widened the saga to other types of "hidden" commission payments and raised the possibility of millions of motorists receiving pay-outs.

"The search did not uncover any unopened or hidden areas within the facility," a White Helmets statement said.