What is the Add to List Button for?

Can anyone tell me what the Add to List button is for on the MyEbay page for sold items? Add to what list? I don't want to press it for fear of losing anything off my page. Also, how do I access archived transactions? Some of my history (from 2009) has disappeared off MyEbay so I can't leave feedback etc. for those ebayers who take too long to close a transaction. When you sell a lot, it seems items disappear off the page a lot quicker. Cheers

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