Migration from v4 to v5 - are all invoices moved

I want to know are all invoices copied from V4 to V5 . I seem to be missing some invoices.

My current number is 900, but I only have 350 invoices. I started with 00001.

Is there a method to retrieve the missing information.

Hi,

All invoices are copied over.

Which URL are you using to access the app?