Is it permissible to deceive the customs of a non-Muslim country when exporting goods, and does the money resulting from that go to the company or to the owners of the goods?

It is permissible to use stratagems to evade customs if the state collects them unjustly, because in that case, they are considered unlawful imposts. The use of stratagems to avoid paying them then falls under the category of repelling injustice. However, if the state collects them in exchange for services it provides, then it is not permissible to evade them.