Used equipment can be good as new or in excellent, perfect condition, but it can NEVER be MINT!
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For something to be mint it has to be in a sealed factory box just arrived from the factory. As soon as you open that box ALL the mintyness escapes. Now you have used equipment in excellent condition. It is good but it has lost its mintyness.
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Those who claim their used equipment is minty are misrepresenting it hoping buyers will not notice. Or maybe it is an innocent mistake. Makes you wonder what other innocent mistakes you might find if you buy it.
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It is safer to bypass all postings claiming mint condition.