I've never heard this claim of Costco removing serial numbers from watches - have you seen this personally or have other proof of this?
Costco does offer repair services, and they have their own repair facility in the US:
They will repair, replace, or refund - I can't say many brand boutiques, AD's, or grey market dealers offer the same sort of warranty with no questions asked...
As much as you may try to run them down, they are as legitimate as any other grey market dealer.
Cheers, Al
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