QAR
The QAR will have picked up an "Out of Config" warning and high lighted it as an "trigger event" for those whom monitor such things, it will be plain as day. plus on most modern aircraft the "ACARS" system will also dob in an errant operator to his/her masters if an exceedance, config or fire warning is triggered. (Not sure if this true for the 737 classic)
The aircraft will send a message to ops, maintenace watch etc so there is no where to hide.
I am pretty sure most tech crew know this and would have self reported.
Get off your soap box "aircraft". Regulation of safety is well in hand without your assistance.