Yes, actually it's very tough. There are two incidents I remember (out of 11-12) when I got LBs, once March 2020 in 18181 (running upto Chhapra). 2 seats and both LB in 2A
Once, recently in June 2023. In 02832 BBS DHN Special (Sleeper). This was bound as there were plenty LBs available and I had taken ticket when it was in WL.