Unlisted LA-ICB slip

While checking some covers, I happened to find this US slip inside a cover posted from Los Angeles to Norway Mar 13, 1942. The cover was censored in California (censor # 2310), and the slip enclosed, and the return handstamp applied. A few comments: The pointing finger handstamp, I suspect, was used in Los Angeles. The usual two lined RETURNED TO SENDER/SERVICE SUSPENDED was used in San Francisco and not used on this cover.
The label is, to my knowledge, unlisted. In Russ Carter’s resource, it would probably be included on page 32. The label is the same format as labels NC-12 and OC-12. The label identification “LA-ICB (2/3/42) 500” is the only one that I know of using the “LA” ID. (Los Angeles).
Besides the “2317” is a marking in light red “Examiner 2310”.
Any comments on the “LA” identification and this cover would be welcome.
The label is, to my knowledge, unlisted. In Russ Carter’s resource, it would probably be included on page 32. The label is the same format as labels NC-12 and OC-12. The label identification “LA-ICB (2/3/42) 500” is the only one that I know of using the “LA” ID. (Los Angeles).
Besides the “2317” is a marking in light red “Examiner 2310”.
Any comments on the “LA” identification and this cover would be welcome.