This is an immigration question. Pass to that area.

Unless it's $10,000 or more, which must be reported to the IRS, and/or it's for an illegal purpose (i.e., money laundering, payment for illegal...

Who is the CBP? It's hard to understand your question without knowing what agency that is.

Ask the Canadians -embassy or consulate.

Read the transport contrat carefully and see where the jurisdiction of the contract lies. If this is indeed worth many thousands of dollars, it...

If the airplane is Austrian the primary jurisdiction is Austria. Hire an international lawyer to see what other options you have, if any.

If you are an American citizen you must enter the US with your American passport. If not it's a felony. For your tax issues, hire an...

This a an issue for Honduras. Contact the local Honduran embassy or consulate or hire a Honduran lawyer.

Of course you can. Make things easier by having him make a will here that specifically notes that he owns property in Mexico. Or have him make a...

his is a tax question. Pass to that area.