Poorly Imported

Maybe someone can help me - I imported a batch of invoices yesterday and they all imported with a date of 12/31/1969 (don't ask).

I am trying to delete them and import the information correctly (I believe this had to do with the way I formatted the dates). At any rate, the help files say I can delete multiple invoices but there is no delete key anywhere I can find when I select a row of invoices. I also noticed that I cannot make these invoices "open" (which I don't necessarily want to do).

Since there are over 200 of them I'm not too keen on the notion of deleting them one at a time! Any thoughts?