I haven't a clue. I don't recall ever hearing anything of this sort.
It's particularly suspect because Crowley never solidly settled on it until about the time he wrote Liber Aleph. His personal communication interaction with Case was a few years earlier in NY, and wasn't really a peer relationship. Also, Case wasn't solidly anchored in is own reconstruction yet. It's possible that a conversation occurred despite all of this, but it doesn't feel right.
Love is the law, love under will.
Yours in L.V.X.,
Jim Eshelmanwww.jeshelman.com"Success is thy proof: argue not; convert not; talk not overmuch!" - CCXX 3:42