Paul,
I don't believe you would find anything about the grave location of Pvt. Reeves in the book Liz recommended because it only goes up to 30 Nov 1861. Your ancestor's compiled service record has two dates of death listed - 14 May 1863 and 14 Aug 1863. I would believe the latter date because of additional info I've seen (see what I include about T. W. Newsome). There is also a card in his record that mentions to see the personal papers of Assistant Surgeon T. (Tom) W. Newsome. I highly recommend you obtain a copy of Newsome's compiled service record because there is much info in it about your ancestor. Many of the 49 documents in Newsome's record on microfilm are very hard to read, so it may be worth it to contact the National Archives and ask them to make copies of the original documents in Newsome's record since several parts of these documents are what I would describe as being llegible. Newsome was accused of negligence in the death of Pvt. Reeves resulting in a board of inquiry taking place. Since Pvt. Reeves died in 1863, his remains may have been returned home for burial by his family instead of being buried in Savannah. You may want to give Laurel Grove North a call (see http://www.savannahoffthebeatenpath.com/Places/laurel_grove.htm for the phone number) just to double check to see if your man is buried there. I would also call Bonaventure Cemetery and ask them, too. Good Luck!
Ed