Good question, maybe you don't have the whole story? I wonder why the Rs would tell LE all the doors had been locked if they were guilty? Now THAT would be something to lie about, don't you think?...
Regarding the "fact" you've shared from Kolar's book; These excerpts paint a slightly different story than that which is presented in FF.
PMPT (p. 405): "The second addendum to the search warrant noted that when Sgt. Whitson first arrived at the Ramsey house, he noticed what seemed to be a pry mark on the door jamb. The damaged are 'appeared to have been less weathered than the surrounding surfaces on the door and door jamb,' the document said." (Schiller, 2000)
Ramsey Search Warrant Addendum; 12.29.96: "On December 29, 1996, Your Affiant talked to Seargent Bob Whitson of the Boulder Police Department. Seargent Whitson told Your Affiant that he responded to 755 15th Street, City and County of Boulder, State of Colorado at approximately 0930 hours on December 25, 1996 in response to the report of a kidnapping. Seargent Whitson told Your Affiant that when he arrived that the Ramsey residence, he entered through the rear exterior kitchen door. He told Your Affiant that as her entered the residence he saw what appeared to be a pry-mark in the door jamb of this door. He told Your Affiant that the mark he observed was on the exterior of the house near the door knob and lock on the door, and that the damaged area appeared to have been less weathered than the surrounding surfaces on the door and door jamb."
LE uses divisive tactics to "break" suspects. The Fernies weren't the only friends the Rs lost due to, at least partly, an environment of suspicions & mistrust the BPD knowingly created through false leaks and misrepresentations of facts, both, through the media & in conversations/interviews witnesses...