I am planning to buy gen2 AirPods with wireless charging case. Can I get the product engraved after few days of purchase from a different retailer?
NA
iPad Pro, iOS 12
Question marked as
If you mean if someone other than Apple can engrave them, you would have to ask the retailer. Note that its possible any third party engraving may void your warranty.
Apple will only engrave them during purchase. There is no post purchase Engraving service from Apple.