If they did not send them to you via a premium service like Global Priority, 6 weeks is not out of line for one of the ultimate snail mail options...Can take up to 3 months depending on where from or to. They will probably still show up if that is the case.

Hewre is a scan of a little known PO form that I use when shipping uninsured stuff out of the country. Costs 90 cents and verifies that you shipped it on what date. It is form 3817.

Mark