How can you inspect the timing belt to see if it was changed?

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I have a 2000 Subaru Legacy Outback Limited that I purchased recently. There were no service reports/any information as to how this Subaru was serviced. How can you inspect the timing belt to see if it was changed? There was also a mention about other parts needing changed and included the water pump. It also talked about seals, belt tensioners, etc. I'm trying to sell this Subaru and I don't want to tell a buyer that the timing belt has been changed. Thanks in advance for any and all help provided. Stuart stu132u@aol.com 407 718 1788