Why was he living under an assumed name...
Spies are known to occasionally use an alias..... Lee had been trained as a US intelligence agent ....
But your question is interesting.... When Fritz asked, Lee readily admitted that he was registered as O.H. Lee at the rooming house..... He told Fritz that Mrs Roberts made the error when he rented the room...
I don't know if that is true..... So it raises an interesting question......
WHO was Lee hiding from?.... We know that FBI agent Hosty claimed that was looking for him...and Lee was aware that Hosty was looking for him.....BUT..... Hosty knew that he was working in the TSBD...and Lee tried to contact Hosty when he left the note at the FBI office......
Who was Lee trying to avoid?......