How did the British continental blockade affect Alexander von Humboldt's reports and specimen collections?

During his expedition to Central and South America, Alexander von Humboldt frequently sent reports and duplicates of his scientific collections from various commercial centers to his brother, Wilhelm, and to scientists in France.1

However, the continental blockade enforced by British ships during the Napoleonic Wars significantly hindered these efforts. This naval blockade prevented the majority of his mail, including his valuable scientific findings and specimen duplicates, from reaching their intended destinations.1