I am generally a big fan of the ⁦@USPS⁩, but we just had a holiday gift returned – a 2017 holiday gift, exactly 364 days after we mailed it to an address some 23 blocks away! pic.twitter.com/4Zvbc0rHJD

— Stu is on X 🚐 🚘🚇💺🚉 (@stuloeser) December 20, 2018

Former Mayor Bloomberg’s press secretary had a Christmas package returned to him in the mail — almost exactly a year after trying to send it 23 blocks away.

Stu Loeser tweeted about the head-scratching return Thursday and posted a photo of his battered-looking cushioned mailer, which cost $3.12 to ship.

“I am generally a big fan of the ⁦@USPS⁩, but we just had a holiday gift returned – a 2017 holiday gift, exactly 364 days after we mailed it to an address some 23 blocks away!” tweeted Loeser, who now runs his own media strategy firm, Stu Loeser & Co.

The gift inside the package was a signed copy of Tina Brown’s “Vanity Fair Diaries,” which came out last year, Loeser told The Post on Friday.

He said his company sends out signed copies of books each year to clients — and that this particular parcel was meant for someone at WeWork’s headquarters near Union Square.

“We sent it to a bunch of people who work at the WeWork offices on 18th Street. One person never sent us a thank-you note — and now we know why,” Loeser said.

Initially, staffers feared the returned package was part of this year’s batch of gifts — signed copies of “Shade” by Pete Souza — that were shipped out just last week.

“Our first thought was, ‘Did we just send out 100 some books this year without enough postage?’ ” Loeser recalled.

Upon closer inspection, the reappearing package included an erroneous zip code as its return address — explaining its non-delivery — though its whereabouts for the past 52 weeks remains a mystery.

“You still have to wonder, where was it for the last year?” Loeser said.

Asked whether he’ll be tossing it back in the mailbox for delivery, he quipped, “I’m going to hand-deliver it myself in January.”