"We would appreciate it if you could let us know when you receive the item."
"We would appreciate it if you could let us know when you receive the item."
"We" 「我々は」
"we would appreciate it if ~" 「我々は〜幸いです」
"you could let us know ~" 「〜教えていただけますと」
"when you receive the item" 「商品を受け取った時」