An autoharp, just one of the items that riders have lost on the train in recent weeks

When forgetfulness strikes on the F train, commuters are contacting Craig.

Craigslist, the source for apartments, dates and jobs, has become the go-to site for sad straphangers realizing they left something on the subway.

“My wife is furious at me for losing my wedding ring,” one man posted recently after dropping it near the Bergen Street F train stop. “Please save me!”

The MTA has automated its lost-and-found process, but riders are still flooding Craigslist to post personal appeals for their stuff, along with Good Samaritans looking to help out.

“It reaches the broadest audience of any free forum I know of,” said Josh Benfey, 30, a Brooklyn straphanger, who has turned to Craigslist twice when he lost items on the train.

While combing through dozens of lost and found ads on Craigslist over the last four months, amNewYork found:

- The most common posts are for cell phones, wallets and cameras, especially those owned by tourists. “It was my wife’s first time on the subway… Believe me she will not make the same mistake twice,” wrote a tourist who left a Sony camera at a No. 7 station.

- Jewelry, instruments and personal notebooks are the fodder for heart-breaking appeals, such as a woman who lost a necklace that was rescued by a great-aunt fleeing her home during World War II. “The necklace has tremendous and incalculable sentimental value,” she wrote.

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- Drinking does indeed cause forgetfulness, including a man who fell asleep after a few “mixed drinks” and lost his bag. “My whole life was in that bag,” he wrote last week. “I desperately need the important papers inside, my keys and any medication… I am not rich as you can see by the pay-stubs.”

New Yorkers offer elaborate rewards for their missing stuff, including hugs, beers, dinner, Dell speakers, “karma,” diamond earrings and rewards of up to $2,000. Sadly, many people don’t get their stuff back, with one rider only receiving spam from his post.

“It’s unfortunate,” said Joshua Garcia, 29, a Manhattan rider who got zero responses to his post about a folder full of legal papers.

Still, many straphangers go above and beyond to reunite people with their stuff.

“I tried turning (your bag) into two different subway employees, but neither of them would take it,” wrote someone who found a sack with Yankees hats and a figurine.

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Notable lost items on train include:
- Three Mother’s Day cards
- Tools for tuning pianos
- A stuffed shark named “Phillip”
- “My MIND!”
- A lucky penny that could cause its owner to fall into “ an eddy of despair” if not found
- A size “00P” suit jacket
- An autoharp
Source: Craigslist