The medals belonging to multiple World War I and National Servicemen were anonymously mailed to The Courier on Monday evening with a typed letter that read: "Please find enclosed some medals that I think belongs to some family member that lives in Ballarat, please find the rightful owners."

While it isn't known what connection many of the servicemen have with Ballarat, National Servicemen's Association Ballarat sub branch secretary Ron Douglas believes one of the medals may belong to Ballarat's Murray Dyer.

"Every National Servicemen got one of those medals and looking at those initials I'm sure it belongs to Murray Dyer, of Dyers Steak Stable," he said.

Details of the medal, an Anniversary of National Service 1951-1972 Medal, have been difficult to find, with information available on Dyer on The National Servicemen's Association of Australia website minimal.

Mr Douglas' theory seems probable with the service number on the website clearly matching the number found on the rim of the medal.

"The nominal roll isn't official so finding details is hard and Murray passed away quite a few years ago," Mr Douglas said.

"And what happened to his defence medal?"

The four remaining original World War I medals and their replicas were also handed in with the only hint of a Ballarat connection inscribed inside the box they came in. The inscription read Gems & Jewels Ballarat.

The service numbers and names on three of the medals and identification tags match service details of Geelong butcher Private Leonard Dyer, who enlisted in 1914 in the 13th Light Horse Regiment, C Squadron.

Dyer served in the Squadron with Sebastopol bank manager Lieutenant Louis Henry Morris and Snake Valley men Private Alexander Scarff, James Watson, Ellis Yeoman and driver George Leeman before returning to Australia on April 11, 1916.

The fourth medal matched details of Western Australia pearler Private Gordon McRae of the 10th Light Horse Regiment, A Squadron, who was killed in action at Walker's Ridge, Gallipoli on August 7, 1915.

It's not known whether the servicemen were linked in any way.

Mr Douglas said there could be multiple reasons why medals from three different servicemen have ended up together, with many medals bought at auctions, others discovered in old houses and many often proceeds of thefts.

"It's a bit sad they've just turned up like this, there must be a descendant of them all," Mr Douglas said.

If you have any information about the descendants of any of the medals email alicia.thomas@fairfaxmedia.com.au