RF Connectivity

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I am onto implementing that for FHEM.
One thing I noticed and could not understand. Usually the periodic data message for the CO2 sensor looks like this (there is some sort of envelope from the RFX, so the message length is 10 bytes instead of the raw 6 byte message you are sending):

0a  7100 b2 8676 00 01c070 69
                     
sensor ID (0x86 -> 134)
3 byte value

So these are regular data messages with the default sensor ID of 134.





But when booting the device I always get a message like this but only once:

0a 7100 9a 42b2 00 0003e8 69



So a message from a sensor ID 0x42 with a value of exactly 1000 (0x3e8). Its always 1000.

Could you please explain what this is?