We are a responsible large Chinese company with great demands in these products. The reason why I asked whether you have any actual products in stock is becasue our boss would like to inspect the quality of your products before ordering and paying. Once the products' quality is ensured and guaranteed, we would like to have long term collaboration with you. We will be able to purchase all of your products if everything is ensured.
So, without inspecting physical products in person with our technical team and our owner, without quality guarantees, we are not willing to pay the deposit.
Would you please pass this message to your senior manager who can maybe arrange a further discussion or meeting concerning this issue please? We believe we will become your largest customer if our collaboration is successful.
Your sincerely,