There's a "package claim" label in the pypa/pypi-legacy Github issue tracker:

https://github.com/pypa/pypi-legacy/issues

What is the documented procedure for handling transfer of package ownership?

On Sunday, November 5, 2017, Stuart Axon via Distutils-SIG <distutils-sig@python.org> wrote:
Hi,
   I realise this is the wrong place, but does anyone know who could help resolve ownership of the Pypi package PyCairo



There are also a bunch of similar tickets, I guess nobody checks these any more ? :(

S++