Problem has not recurred since, and camera is still operating. SDcard is a probably Samsung PRO endurance, which has been the most reliable for my 10+ cameras. Another issue with this version of the camera is that the voltage tolerance is tight, one must use the included power supply. Previous version of this camera did not have this issue.

@coldevening thanks for the alert. More details on the busyBox vulnerability: https://www.pcmag.com/news/366949/internet-of-things-devices-have-a-serious-security-problem

Problem recurred while camera was protected from rain. Electrical contact cleaner spray for the card and slot seems to have remedied for now.

Playback works as expected for video recorded 11mar2019, but still fails for 10mar2019 after 0200. Playback on android app works fine for all time periods. http client has the proper DST, now matching the camera fw time (which is correct). Will just have to wait for the changeover to Standard time to see if bug can be reproduced.

Interestingly, the http client does playback correctly, albeit with slider-bar time incorrectly at Standard Time. Camera FW switched to DST properly.

Is anyone able to playback video recorded after 02:00 local time? This was the time for the switch to Daylight Savings Time in USA (California). The video plays back as expected prior to 02:00, but fails with no response after this time.

Reolink PC client: 7.2.2.28
Windows 10
Latest posted firmware on 9 cameras

Adding an outlet to the junction box, and then plug in the reolink adapter should work. If exposed to weather, use a weatherproof in-use cover over the outlet. Make sure you have wifi signal at the location before doing all the work, of course.

How about a separate sensor for mbox opening, then use that time-stamp to check the video? An ESP8266 has gpio and wifi. Probably not good for real-time alerts (but IFTTT should work), but possibly ok for daily review.

I agree that it sure would be nice to have an expanded cgi command capability. Brainstorming, one could put the camera inside the mailbox, which would trigger only when opened. Probably need PoE if your mbox is a metal Faraday cage. Alternately, its fairly straightforward to build a rpi zero camera, and then gpio sensors can be added (contact sensor might be easiest in this use case).

Update: After SD card was again not detected, inspection of card and o-ring sealed slot showed no obvious issue (e.g., no condensate). Moving camera under the eaves to protect from direct rain.