@opal Probably not this key, but here's the old sec.gov document signing key as a consolation prize:
-----BEGIN RSA PRIVATE KEY-----MIIBNwIBAAJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINenTWSM7vrzLADbmYQa
ionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQABAkABRr5ZShEY5TInM7ENwv74
sBpEO1VlMfJMLBae4v+AuqWY84VVD5p289Aj/Nqr+TLDxIlv6tMutm5t7Mkam8b5
AiBmPveycBH/yZ4E/lx8ERfchGLS7Q/hX2ttFS/RT4PpiwIhAOTjxRg2VWt0dqpj
HMUrnsdkO0452SGWuPypvl/Drq0FAiAvyi6sUIWZMPuTCfDgbHzirV4jiHprtNXZ
XpXDF49okQIgQ97KLbDGyXMiUMnM2SZjEYrGDx8WJGCV/82xdqIGpKUCIFrHwky1
ZIFMteKResE2jlw4TLhCmDrq+sxqkOMpcV96
-----END RSA PRIVATE KEY-----