Imo, LE would have been thrilled beyond words if this finding had checked out - they want to find Lisa and close this case. For some reason, imo, it was clear to the CSI team right away that this find is not associated with Lisa's disappearance.
It was reported that the passerby was alerted to check the house because dogs had been barking around it for several days. It was reported that there were "freshly soiled" diapers, and then LE arrived and and corrected - said it looked the diapers had been there too long a time (we don't know if they meant the unused diapers or contents of the dirty diapers or both). Imo, these items were put in the house after news of Jersey's arrest for whatever reason and by whomever. Or, the items belong to someone who had been in the house sometime prior to this month. I think more weird things and findings will occur if Lisa isn't found soon. There is a lot of publicity surrounding this case and it's going to draw out some craziness. IMO...
That being said, it would be great if this was a pertinent find and LE is minimizing it for now. Could mean Lisa was alive and well recently. I just trust that LE is being honest here and there was something obvious that prompted them to discount this finding immediately. JMO.