Did they know what it was?
"The following commodities are NOT acceptable for transport by DHL UNDER ANY CIRCUMSTANCES. This is a result of a policy decision, following the full consideration of Operational, Legal and Risk Management implications.
Animals
Bullion
Currency
Dangerous goods, hazardous or combustible materials (as defined in IATA regulations) including asbestos
Drugs / Narcotics (illegal)
Firearms, parts thereof and ammunition (Firearm parts may be acceptable for carriage domestically within USA, please contact DHL Worldwide Express for details)"http://www.dhl-usa.com/intlsvcs/wrdusa/commod/Guidelines.asp?nav=InternationalService/CtryDet