Congratulations to nprofile1qqsvqses4kkaj5yvrtgudm0q4m2ajg4rv4czrym7yp26srqm9pjueacpp4mhxue69uhkummn9ekx7mq8zkrsf! Here is the answer to the puzzle.

A: The last painting has a reflective surface. The thief admired the stolen art, only to reveal their identity in its reflection. The collector inspects the painting's surface and recognizes the painting's true value - it caught the thief's reflection.

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