UPDATE: In the last available reprint of the novel published by Charter, New York, in September 1980, there’s an introduction written by Leslie Charteris himself and dated 21st March 1980.
In it he says “(Meet the Tiger) has been out of print for more years than I can guess at, and with no complaints from me. Personally, I would have been very happy to leave it quietly in limbo; I was still under 21 when I wrote it, more than 50 years ago, and am no more anxious to parade it than any other youthful indiscretion”.
He goes on to confirm his dissatisfaction with the contents, and follows this with: “However, I can’t deny writing it, its existence is a historical fact, and I suppose that anyone who is interested enough in backtracking into Simon Templar’s and my own adolescent beginnings has a right to access to the awful truths.”
This is the edition mentioned in the title’s Wikipedia entry as the last to see print. I don’t know whether it means that LC blew hot and cold over the book’s availability throughout his career, or if it was only after 1980 that the rights were returned to his control and he could put his wishes into action.