Quoting from [sktyagi]:
I request the senior members to explain the terms Customs invoice and Consular invoice and what is the difference between them?
Here's two sites you can look at.But in my opinion ther're very similar.
http://www.wachovia.com/corp_inst/page/0,,44_47%5E2%5Elist%5EC_872,00.html
www.genomichealth.com/oncotype/logistics/oncotype_customsinvoice.doc -
This site gives you an example of the Customs Document.