I just read a news report on a case here in VA. The Heidi Childs/David Metzler murders from 2009. Last year at the 10 year mark, LE had a press conference and as a result starting receiving some tips.
Yesterday, LE announced they received 50 tips in the months after that PC and they, Montgomery County Sheriff's, FBI and VA State Police, have been working on those tips all year and stated they've made significant progress. 50 tips. Not thousands or even hundreds.
What did the investigators get in Abigail and Liberty's case in the first 2 months here. 15K to 17K in tips? Granted, they had between 100 and 200 personnel on that task force at that time with participation from over 20 agencies. When LE had the 'new direction' press conference last year they received 2,700 new tips.
Police Receive More Than 2,700 New Tips In Delphi Murders Of 2 Girls After Releasing New Suspect Sketch
2.7K in tips with a task force that is much smaller now. That, in addition to about 50K tips prior to that point. I don't care what database software package you are using that is a huge ask of LE to run down tips. Many times when investigators stall on a case they go back over what they have. Having that many tips with a smaller LE group now is a daunting task to go back to the beginning.
I've wondered for some time now if LE doesn't already have a tip on the suspect in those tips. If that does turn out to be the case, maybe, as you indicate, the problem is that there wasn't sufficient detail for LE to run it down.