Took my kid to a museum in Denver and the sign next to the bones was flat out making things up
The placard said the skeleton was 3,000 years old and used for ritual burials, but when I asked a grad student in the corner she admitted nobody has carbon dated it yet. I get that museums need to tell a story, but a guess printed in white vinyl reads like a fact to everyone who walks by. Is it just me, or should dug up stuff sit in storage until we actually know something?
The real problem is the museum has no reason to correct the sign later since they already got your ticket money, its not like you get a refund when they finally run the test. Storage costs money too, so I bet most places would rather slap a guess on a placard and call it education.