我翻译的版本，还检查修改了一下，希望对你有帮助
The goods in our store do not accept returns.
The short-term stay visa bearers can enjoy tax exemption with total consumption of more than 10,500 yens(expendables excluded)
Are you buying this as a gift?Does it need packaging?
You can enjoy a discount exclusive to members for all products in our store after acquiring a membership,which only costs 500 yens.No extra fees will be charged.
No certification is attached/enclosed herewith in the product.
Here is the counter for second-hands/reach-me-downs,while over there is for new arrivals only.
Sorry,according to the in-store policy,you can take out no more than two products to try on.
It's free of charge to adjust the strap length of the watch.
Could you give it a try of the lighter?
Can the certification be stamped within our store?
The certification shall not be valid without stamp.
Can it be settled first?
（话说楼下的明显是机器翻译的额。。）
