I contacted Viabox customer service on Monday, and they suddenly found my package on Tuesday. Wonder where it was was the last two weeks? Then I tried to ship it. Cheapest post option was $35 (Stackry last week was $25) and somehow, despite my not using Viabox since two houses and a different country ago, they had my current address for me to select! Sadly, I was unable to complete my order as the only clickable postal option was to upgrade to a monthly subscription! Tried on both Firefox and Edge.
So I've contacted CS once again, explained the problem and asked them to throw my order away as it was only worth $26 (old rare Australian comedy movie and a Focus on Louise Brooks).
My Stackry order should arrive today, as I just paid the French Customs (€10 handling and €3 per BluRay).
Long story short - don't use Viabox.