Hmmm. I agree to some extent. Unfortunately, if the item has been extensively handled or curated, I'm not sure you can get a decent age off any of the surfaces. The problem is similar to that of items excavated before modern archeology came around. So much context has been lost, and so much has been done to them, that it's unclear how much, if anything, you can learn from the exercise.
My <0.002 cents,
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