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Even if I may wait for my lens, by no mean I will wait for more than 3 weeks for them to ship it. The reason? It is too close to the 45 day limit for me to file a claim with eBay. 21 days + shipping time + communication with seller about shipment is just too close to 45 days, I guess. It is just too easy to miss the 45 day limit.
I know I can directly call my CC company to ask them to dispute the charge after a week or so wait time. That way, I'll let CC company to deal with PayPal, eBay, and the seller.
I seriously suspect the seller is using our payment to buy the lenses afterward. They have low stock because they lack money.