It could mean a lot IMO.It probably doesn't mean anything...but do y'all remember that there was an HVAC repair van that was at the 1122 King property just a couple of days after the killings? I always thought it was odd that LE seemingly called in a air conditioning and heating company to the crime scene so close after the murders.
Possibly BK became a suspect sometime on or just before December 7 (the day the contractor was at the scene) and LE was aware of his HVAC background and wanted all the vents checked for the weapon?