Purchased redmi buds 6 pro

Purchaseed these today to gift my brother.

Store owner said this is the Chinese version and I said I'm looking to buy Global version. Then the store owner said this is his last unit and said he will give me an discount.

I've asked for US$30 and he said he can do US$40, l said I'm really interested in the global model and tried to walk away out from the shop, then the owner yelled at me $35 is the final price he can do also he'll throw in silicon case and cleaning cloth.

He literally yelled at me "Take it or leave it final is 35!!!" I bought it actually since it was sealed and all.

I'm kinda skeptical about the seller himself and his behaviour. Because he somehow wanted to sell me this and get rid of it.

Is there anyway to find the manufacturer date of this unit?