Civil Code, Art. 1584

Where goods are delivered to the buyer, which he has not previously examined, he is not deemed to have accepted them unless and until he has had a reasonable opportunity of examining them for the purpose of ascertaining whether they are in conformity with the contract if there is no stipulation to the contrary. Unless otherwise agreed, when the seller tenders delivery of goods to the buyer, he is bound, on request, to afford the buyer a reasonable opportunity of examining the goods for the purpose of ascertaining whether they are in conformity with the contract. Where goods are delivered to a carrier by the seller, in accordance with an order from or agreement with the buyer, upon the terms that the goods shall not be delivered by the carrier to the buyer until he has paid the price, whether such terms are indicated by marking the goods with the words "collect on delivery," or otherwise, the buyer is not entitled to examine the goods before the payment of the price, in the absence of agreement or usage of trade permitting such examination. (n)