National Rifle Association Chief Executive Wayne LaPierre billed the group’s ad agency $39,000 for one day of shopping at a Beverly Hills clothing boutique, $18,300 for a car and driver in Europe and had the agency cover $13,800 in rent for a summer intern, according to newly revealed NRA internal documents.

The documents, posted anonymously on the internet, provide new details of the clothing, travel and other expenses totaling more than $542,000 that Ackerman McQueen Inc. alleges Mr. LaPierre billed to it.

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The travel expenses allegedly include more than $200,000 in “Air Transportation” costs during a one-month period in late 2012 and early 2013, in part related to a two-week trip over Christmas to the Bahamas by Mr. LaPierre.

The additional details behind the ad agency’s claims comes as Mr. LaPierre faces internal scrutiny at the NRA over his expenses amid an extraordinary falling-out between the NRA and Ackerman McQueen.

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The NRA released a statement from Carolyn Meadows, its new president, who said the “entire board is fully aware of these issues. We have full confidence in Wayne LaPierre.” She added that “it is troubling and pathetic that some people would resort to leaking information to advance their agendas.”

Mr. LaPierre didn’t respond to a request for comment sent through the NRA.

This story continues in the Wall Street Journal.