The cameras only have a warranty when accompanies by a sales receipt from a authorized dealer, so it sounds like no warranty. Hopefully, they have not been stolen.
There is a big demand for them on ebay, you can sell them and ship to the USA / Canada with no duty. However, unless you have a good ebay selling record, it might be difficult selling high end items. Certainly PayPal will hold on to your money until the buyer is happy.
Contact Adorama or B&H, ask them if they are interested, but you will need to explain how you acquired them and provide proof that they are legitimate and not stolen. That might turn a quick $3,000 or $4,000 profit to you.