He is recorded as being awarded the CB for Boer War service, an honour he declined.
His own reasons as reported in newspapers was that it was a war that had to be fought to establish people’s rights and he was honored to do so for his King and Country but he had good friends on the Boer side so he would not profit in anyway either through money, advancement in rank or the receipt of honours.
You say replaced but are they not possibly first time issue albeit late in the day? In other words he was a late claimant. The fact that (let's assume he applied himself) he applied for the medals just prior to his death would indicate to me that he wanted to pass them on to a near relative perhaps?
I note he seems to have lived out the last few years of his life in the USA which tallies with the location of where the medals are being sold today.