Just an update - after putting a message on the FB page, they did get in contact with me and asked me for some details.

After doing all this and going back and forth a bit, they sent me a message to say that they could not locate it.

They are sending me a money order for $8.50 for shipping as well as a $50 money order to compensate for the contents.

Unfortunately the package was valued at just over $72, but I guess it is better than nothing.

Now to tell the customer.....