My website has nearly 2,000 articles and all of them were exported. Not sure why yours were restricted to 1000 only.
If your aim is to display article that was published ‘ten years ago’, I found something which you may tweak in your theme:
The code here gets all the post published in the 11th month (November):
{{#get "posts" filter="month:11"}}
{{#foreach posts}}
<h2>{{title}}</h2>
<p>{{excerpt}}</p>
{{/foreach}}
{{else}}
<p>No posts found for November.</p>
{{/get}}
I believe something similar can be done to get posts from specific month, year or date.
I let you explore that in Ghost documentation