Quote - @EClark1894:

Quote - You will be able to search your order history indefinitely.

Could I search my order history from old store or new store indefinitely?

I can only quote what they say on their support page:

 

* *

Purchase history - Your old account is still there!

*The old CP Store is now available at http://retro.contentparadise.com. **You will always have access to your old account with all of your saved purchase history for orders placed prior to June 1, 2009. *You just log in with your old username and password to visit your MyStuff page. We also provide a link to that site in your NEW Account - so you can pop over to visit your old purchase history whenever you need to from your new account.