I don't have a record of my sales, which (I think) I need for sales tax and income tax. I operate and is tax resident in both Canada and USA.

>Are there any bank records, shipping records, tax deposits, you can use to re-construct some or all of the needed data

Thats what I'm trying to do now, collecting shipping and supply cost documents. However, with amazon's tax documents and sale spreasheet, I don't know how to do sales tax