In a long duration event like this one, melting, sublimation, wind and compaction ongoing during the event can help maintain a decent disparity between snow depth and total snowfall. Personally, I am not a trained spotter, but I am a vigilant and am fairly precise while attempting to follow the NWS guidelines for snow measurement. I am long time winter weather enthusiast and strive to maintain accurate records for posterity. Interestingly enough, my personal experience in this storm sounds very similar to what you described above. I measured a storm total of 30.3” at my location. I later learned that a trained spotter from the same municipality reported 30.5” from the event. I also happened to record a time lapse video for the duration of the event, focused on my snow stake which shows 1 inch increments up to 24”. The snow depth at the stake never quite made it to 22”. While there may be some exaggeration out there and even intentional misrepresentation of snowfall figures, I think most folks on this and similar forums do an honorable job in reporting their totals.
Subforum protocol issues aside, factually--the original statement is inaccurate. Latest AFD from Mt. Holly: "FOR SUNDAY INTO MONDAY...MORE OR LESS ZONAL FLOW CONTS FOR THIS PERIOD AS A WEAK RIDGE OF HIGH PRESSURE BUILDS EAST ACROSS THE AREA. WINDS WILL FINALLY DIMINISH AND TEMPS WILL BE NEAR SEASONAL NORMS. FOR MONDAY INTO CHRISTMAS DAY...A WEAK LOW PRESSURE IS FCST TO TRACK EWD AND PASS THROUGH DELMARVA EARLY XMAS MORN. THIS WILL BRING SOME LIGHT PRECIP TO THE AREA PROBABLY STARTING LATE MONDAY AFTN. PCPN TYPE IS SMWHT UNCERTAIN...ATTM IT LOOKS LIKE COASTAL NJ AND SRN DE WILL BE TOO WARM OVERNIGHT FOR ANY TYPE BUT RAIN. HWVR FARTHER N COULD SEE A MIX OF PCPN...WITH LIGHT SNOW LIKELY WELL N AND W OF PHL. PCPN SHOULD END OVER MOST AREAS BY MID DAY ON TUESDAY WITH RELATIVELY PLEASANT CONDS FOR THE SEASON. HWVR THIS WILL BE SHORT LIVED AS ANOTHER MORE POWERFUL STORM WINDS UP AND MOVES NEWD OUT OF THE LOWER MS VLY TUE NIGHT AND WEDNESDAY. THERE ARE OF COURSE TIMING AND INTENSITY DIFFERENCES AT THIS RANGE...HWVR BOTH THE GFS AND ECMWF ARE INDICATING RAIN OVER DELMARVA AND SRN NJ WITH A WINTRY MIX FURTHER N. THE GFS ENSEMBLE IS SHOWING A LOT OF UNCERTAINTY IN THE TRACK LOW LOCATION WITH SEVERAL MEMBERS FARTHER N...WHICH WOULD RESULT IN MOSTLY RAIN IN THE NRN MID ATLANTIC. THE WEEK IS FCST TO END WITH A WEAK RIDGE OF HIGH PRESSURE AND FAIR WX BUT THEN YET ANOTHER POSSIBLE STORM IS INDCD FOR NEXT WEEKEND."