I have checked for them in Kevin Asplin’s roll of the Imperial Yeomanry -
http://hometown.aol.co.uk/kevinasplin/home.html - but the only Place listed is Lt Edward Herbert Place of the 15th Company. This site, plus an incomplete casualty list -
http://www.roll-of-honour.com/Databases/BoerDetailed/index.html - are the only online sources I know of for the Boer War.
“7 years Imperial” probably refers to 7 years as a regular in the British army. Men would enlist for 12 years, and after 7 years had the choice of going into the Army Reserve to serve out the remaining 5 years. As such, if his service papers survive, they will be in series WO97 in Kew. They are in alphabetical order so you do not need to know his regiment, but they are original documents so you have to visit Kew or employ a researcher.
His DoB fits in with him enlisting in the army in the late 1890s, serving through the Boer War, then transferring to the reserve a few years later.
Ken