Ron,

I hate that kind of installation. So many things can go wrong. Architects... Oy!

I would expect flashings, but you might not see them if the shingles are lapped over them. If you are seeing stains, leaking is likely. I once (maybe more than once) made the wrong assumption and said probably old stains. Needless to say, it did leak at the next rain.

Note stains and likely leaking and recommend repairs. If the seller says that it has been fixed, the seller should provide documentation. But, you knew that already.

Was this the one in foreclosure? Doesn't look like a river home.

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The apostrophe troll.