Personally, I believe that James Tyrell smuggled the boys out of England from his home at Gipping Hall. The boys were actually seen there with their mother, Elizabeth Woodville, after she had been reunited with Richard the Third. Tyrell was sent by Richard on a secret mission to Europe at this time (this is documented). I believe they were first sheltered by the king’s sister and then scattered to history. Some people feel Perkin Warbeck was the younger boy but I’m not sure.
Many of the relations and early youth ties that were forced from Warbeck in his confession turned out to be real and verified people under later inquiry.
All that I have read about Warbeck indicates a fraud brought about by wishful thinking on those that helped him in his claim.
The lengths you Ricardians go to to try to rehabilitate this evil man is genuinely astonishing.