MuChen Hsieh was praying for a miracle to find the $170,000 violin she left on a bus, and with the help of the Philadelphia Police, she got one.

The 19-year-old music student left her prized violin - made in 1835 in Naples - on a Megabus she had taken from Boston on Tuesday.

Hsieh, a native of Taiwan, is a student at the New England Conservatory of Music and attended high school in Philadelphia.

She reported the loss to police, who called the bus company repeatedly. Company officials said they didn't have it. On Thursday police called the bus line's cleaning company, where workers also said they didn't have it.

On Wednesday night, police put out word that they were seeking the violin's return, no questions asked.

On Thursday it showed up. No questions, no answers. The investigation is now closed, said Lt. John Walker of the Southwest Detectives.

Walker said we all look for Christmas miracles this time of the year. "In this case," he said, "We got one."

Hsieh was so happy she hugged detectives, then took out her violin and serenaded the gathering at a 3 p.m. press conferences at the Southwest Detectives office.