In the Official Records,Series I, Vol. XLVI, page 336,

Captain Joseph Carter, 3rd Md. Infantry, US made his report dated March 27, 1865 and said this about the Action at Fort Stedman....."We then occupied the left of the
line of breast-works, and when the enemy commenced to retreat we charged along our works and were the first to re-enter Fort Stedmnan and Batteries Nos. 11 and 12, capturing some 200 prisoners. Corpls.Edward Mitchell and John H. Locker took off as many as eighty rebels,
in eluding nimue commissioned officers.We captured two stand of colors: one belonging to the Fifty-first
Virginia Infantry, captured by Capt. Joseph F. Carter; the other belonging to the Twenty-seventh Georgia Infantry (erroneously reported as the Twelfth Alabama Battalion),captured by Private Patrick MeCran, of Company C, Third Maryland Battalion Veteran Volunteer Infantry."

I have never found any mention of the 51st after Fort Stedman. Quite possibly the entire contingent was in the 200 prisoners mentioned by Capt. Carter. The detachment that managed to survive the Waynesboro debacle could not have been very large to begin with. However they ended up, the 51st had an outstanding record of service to the end.