Tyrelle Mack, 27, was caught when Border Force officers intercepted two packages from Slovakia and one from the Czech Republic containing four weapons.
The packs are handed out to men, women, and children to replace their seawater soaked clothing when they arrive in Dover after their dinghys have been intercepted by Border Force vessels.
Two dinghies carrying 190 people were spotted by Border Force vessels on Tuesday despite poor visibility - taking the provisional total for 2025 to date to 1,019 in 18 boats.
The main French transport federation has complained that Border Force checks to ensure migrants are not hiding in French lorries and heavy goods vehicles are too harsh.