First of all — please accept our apologies for not getting back to you anytime earlier! This last month was packed with big upgrades and shifts in our company which caused a lot of unattended & unorganized work, especially in the customer support department. We are following up now and are deeply sorry for not replying any earlier!
As for your problem — I'm afraid we are currently only able to index posts that reach for about three months back or the maximum number of around 100 posts per blog. If you find that this is not the case, please do not hesitate to reach me on my email address with the link to your blog and we'll be more than glad to take a closer look!
Here's my email address: firstname.lastname@example.org
Looking forward to your reply and I promise we shall answer it in a much more timely fashion! Take care & have a nice day!