Cadillac Seville STS, rebuilt engine or not? How can i tell?

THINKING OF BUYING A USED 1995 CADILLAC STS, AD SAYS 190,xxx BUT ONLY 30K ON REBUILT BUT THE OWNER CLAIMS THEY DON'T HAVE THE RECEIPT FOR THE REBUILD, IS THERE AN EASY WAY I CAN TELL IF IT HAS BEEN REBUILT?
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