My PCB's from JLCPCB have been blocked by the Belgian customs for almost 6 days and still no news. Via DHL, I sent them a copy of the invoice, a copy of the web site with my order details. But ... nothing ...

I don't understand the reasons. They should have seen thousands of those things and should have a good idea of the real value

Of course, impossible to contact them.
Any idea about what's happening ? Did you already have a similar experience for so simple things ?