He sent a screenshot. At offset 0x7A4F30 in the heap, encoded as UTF-16 little-endian, was a string that had never been part of any source file: "I held. You're welcome." They never found the pension money. The Ohio transit workers eventually got a class-action settlement of $19.95 each.
The packet contained exactly four bytes: 0x4E 0x45 0x54 0x00 — "NET" and a null terminator. Microsoft .NET Framework v4.0.30319.1
Then, silence.