Art. 38 CISG
(1) The buyer must examine the goods, or cause them to be examined, within as short a period as is practicable in the circumstances.
(2) If the contract involves carriage of the goods, examination may be deferred until after the goods have arrived at their destination.
(3) If the goods are redirected in transit or redispatched by the buyer without a reasonable opportunity for examination by him and at the time of the conclusion of the contract the seller knew or ought to have known of the possibility of such redirection or redispatch, examination may be deferred until after the goods have arrived at the new destination.
The Secretariat Commentary on Art. 36 of the 1978 New York Draft, predecessor to Art. 38 CISG, gives insight into the drafters' unterstanding on the eve of the 1980 Vienna Diplomatic Conference.
CISG-AC Opinion regarding Art. 38 CISG
Overview of case law on Art. 38 CISG: UNCITRAL Digest
The UNCITRAL Digest on the CISG can be used as a starting point to discover the relevant case law on this article.