According to a culling of Earth's old information network, Petrenka's secretary, Jean Dufresne, had been given an "executive order" to transfer to a similar podiatry office on Mars for "clerical duties." He worked at a military campus where he had sent the package from when he arrived. Petrenka sent him a package in return, but it looks like no more mail was exchanged between them. Perhaps her package remains at the Mars campus?