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What loss of value? Unless you recently sold your Toyota you have no monetary loss and no case. I doubt there are 6 million new-ish Toyotas sold...
They "tightened it" was all we got from the Service Rep. It is fixed - for now!
Check the compartment under the rear carpet to be sure there is nothing bouncing around. After that, you might want to recheck that spoiler. Ours...