Alsobrook, Robert H., Pvt. 1st Co. Battn. Wash. Arty. La. En. April 5th, 1862, New Orleans, La. Present on All Rolls to Aug., 1862. Roll for Sept. and Oct., 1862, "Absent. Wounded by Explosion of Caisson Sept. 10th. Captured and Paroled by the Enemy." Rolls from Nov., 1862, to Feb., 1863, "Absent. Wounded by Explosion of Caisson, Maryland, Sept. 10th, 1862." Roll for March and April, 1863, "Present." Rolls from May, 1863, to Aug., 1863, "Absent. Sick in Richmond Since May 3rd, 1863." Federal Rolls of Prisoners of War Captured near Fredericksburg, Va., May 3rd, 1863. Forwd. from Old Capitol Prison, Washington, D. C., to Fort Delaware, Del., May 7th, 1863. Paroled at Fort Delaware, Del. Exchanged at City Pt., Va., May 23rd, 1863. Rolls from Sept., 1863, to Oct., 1864, "Present." Roll for Jan. and Feb., 1865. "Absent on Furlough. Time Expired." On Register of Prisoners of War Paroled May 17th, 1865. Age, 19 Years. Eyes, Blue. Hair, Light. Complexion, Light, Height, 5 ft. 8 in. Res., New Orleans, La.
Found this info too, which you appear to alrady have. Have you checked Appendix A and Q?? IF I had to guess since this entry has a date of death and a secondary reference, maybe this is the 'correct' burial place?
Source: http://www.lascv.com/a.htm
Name: Alsobrook Robert H.
Date of Death: Feb 21, 1891
Cemetery Code: LA-JJ-09
Notes: Served in 1st Company, Battalion Washington Artillery; died: 2-21-1891; See Appendix 'A' and 'Q'.
Just below the above listing is the following:
Source: http://www.lascv.com/a.htm
Name: Alsobrook Robert H.
Cemetery Code: LA-JJ-02
Notes: Served in the 1st Company, Battalion Washington Artillery
JIM T