You can find out how much silver you have spent or gained and what items you have purchased on the Silver accounting tab in the Auction area. You will only see the dealings for the last 7 days.
After you click on the Silver accounting tab you will see a table containing information about your silver. In this picture you can see that three items were purchased, how much they were purchased for and your remaining silver on that date. It also shows that there was an adventure and 419 silver was gained. The top line shows how much silver you have tied up currently in auctions. If you click the green down arrow it will show you the items you are bidding on.