You can search for Sellers via the Advanced link to the right of the eBay Search window. Scroll down to the Seller section and enter the ID and complete the Search at the top or bottom of the page.

You'll find all your orders from the past 7 years in your purchase history. It's also the place to go if you need to return an item, pay for your purchases, or view your order details. To improve your help experience, please sign in to your account. Purchase history is the central place to manage your orders.

When was the last time you used the old account? eBay does purge accounts after a long period of inactivity - they send you an annual reminder to login to verify your info so your account remains active. If your account was purged, there is no way to get it back.

If you can't sign in to your eBay account Make sure Caps Lock isn't on. Look for spelling errors. If you recently changed your username or password, your browser might remember your old information. Try manually entering your new username and password.