Your Purchase History only covers the current year, or either of the two most recently completed calendar years. The default view is the last sixty days.
You may be able to spot some transactions on your feedback page if you exchanged feedback.
You can request a report of your older transactions here:
Reports take a week to generate, and then you must use the resulting link within another week before it expires. Transaction data is quite basic: item name and number, date, price, shipping, seller username. No pictures or descriptions.
