393bird,
Try a look on website:
http://www.qsl.net/wd4ngb/fieseler%20werke.htm
It has some links at the bottom as well that give some details about later use.
Waldau appears to have been the base for 10th Air Depot Group in 1945.
It also had the 48th FG (P-47) for two weeks during April 1945.
Waldau had a 4000 x 120 ft runway.
There have been some USAAF landing accidents on Y-96: two involving a C-47 in April 1945, one with an F-5C in June 1945 and one with a P-47 due to an engine failure in November 1945.
Regards,
Leendert