wheel - 7:17 pm on Jan 26, 2011 (gmt 0)
You could also try some good old fashioned social engineering. i.e. get the name of someone at the old company, see if you can give them a call and ask for assistance.
It can be easy or difficult, depending on the folks from company Y and the registrar. I had a person I helped move a website for, his last hosting company guy committed suicide. The colo company where the site resided actually asked for a death cert.