Paperwork is paperwork in Hawaii — even when you’re an astronaut returning from the moon.

Apollo 11’s Buzz Aldrin, whose lunar stroll followed Neil Armstrong’s famous “one small step for a man, one giant leap for mankind” by 20 minutes, posted to his Facebook page the crew’s U.S. Customs declaration just more than 46 years after they became the first men on the moon.

The back down-to-Earth form was filled out in Hawaii.

“Because many people have asked — yes, the Apollo 11 crew also had to sign customs forms when we returned from the moon showing we brought moon rocks and moon dust samples back with us,” Aldrin wrote earlier this week.

An estimated 530 million people watched Armstrong’s televised image and heard him describe the first step on the moon on July 20, 1969.

The Agriculture, Customs, Immigration and Public Health form notes a departure from the “moon,” on “Flight No. – Apollo 11,” and arrival four days later on July 24, the day they splashed down more than 900 miles southwest of Hawaii and 13 miles from the waiting aircraft carrier USS Hornet.

The flight routing reports Cape Kennedy, Fla., the moon and Honolulu, and is signed by Armstrong, Aldrin and Michael Collins, who remained in orbit in the command module on the historic moonshot.

“Moon rock and Moon dust samples” are listed as the cargo.

A declaration of health reports “NONE” in response to a question about people on board known to be suffering from illness. But in response to “Any other conditions on board which may lead to the spread of disease?” NASA states ominously: “TO BE DETERMINED.”

Customs inspector Ernest Murai attested to the fact the trio had entered Honolulu Airport.

If the whole thing appears a bit tongue-in-cheek, it probably was.

The declaration was released by customs in 2009 on the 40th anniversary of the moon mission. Legend has it the government agency realized the importance of the event and required the form.

Space.com reported a NASA spokesman saying in 2009 the declaration “was a little joke” when it was filled out. The Hornet entered Pearl Harbor on July 26. Quarantined in a makeshift Airstream trailer, the astronauts were cheered by 25,000 people as the vehicle was moved to Hickam Air Force Base.

Aldrin, now 85, posted to Facebook that after splashdown the crew had to get into BIG suits — Biological Isolation Garments — “so the lunar dust we brought back wouldn’t give people on Earth our moon germs.”

The smell was described previously as spent gunpowder or wet fireplace ash.

“I always found it funny that the rags used to wipe us down that were covered with moon dust were dropped in the ocean,” Aldrin said. “So the poor underwater creatures got our moon germs instead.”

He added that “maybe this is fodder for a Godzilla movie. I claim the movie rights!”

Aldrin also noted President John F. Kennedy wanted NASA to go to Mars instead of the moon.

“I recently learned at (the Massachusetts Institute of Technology) that he asked NASA and its ranks of engineers and rocket scientists led by Wernher von Braun what was possible,” Aldrin said. “After a weekend of intense calculation they told him that Mars was a little too hard and we should shoot for the moon as a more realistic goal.”