Aiden observed the painting that got Sarah's attention and he understood that is THE meadow. The one Sarah told him about. There is no other explanation why she is staring so intently at that painting while she almost-ignored hundreds of meadow-forest-mountain photos he showed her so far.
"Where is that?", Aiden asked the old man expectantly.
The old man took the painting and brought it to the front for them to see better. He can see that they are interested. Customers! But he does not have an answer to Aiden's question.
"I don't know. When I moved into my current house, this was on the wall.", he explained. "That was more than twenty years ago."
Aiden saw that Sarah's mood dropped. He placed a hand around her shoulder and kissed her temple.