Measure the actual tread depth and give 3 or 4 measurements across the tyre. Above all be honest as any misrepresentation will cause issues with your purchaser. You also ought to state if any puncture repairs or damage to side walls.
Couriers are simple, generally they will pick up from your address and take to purchaser. All you need to do in the case of tyres is attach an address label and they aren't going to get damaged in transit.
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