If the man is just a normal business person having nothing to do with explosives or any other terrorist items then what is the motive to plant these things in his warehouse. It is a waste of time and money by the mossad while maybe some other person is actually planning an attack. Believe me if they arrested this man there is reason.
Remand of Meir Ettinger, Israel's most wanted Jewish terror suspect, extended (Haaretz)
from the article: Report: Thailand terror suspect blames Israel's Mossad for arrest