Something similar happend to me too
I'd requested a CD to be sent from the US to Ireland, internally within the company, for a project for a bank.
Customs rang me looking for tens of thousands of Irish Punts. I escalated to the sender and local managers.
What the senders got concerned about was why the valuation was only a half million dollars, when worth so much more. It was the maximum amount the customs form allowed.
Eventually, the managers resolved the issue, and I got the CD. I don't know if Customs were ever paid.