That's been the million dollar question for ages, poppygirl...and welcome to Bob's thread!
Before 'Disappeared' aired, the timeline was (very approximately, as there were lots of different times) a mid afternoon trip to the hardware store for son in law, then a 3pmish arrival for the housekeeper.
It never quite added up though, but there were no direct media quotes from the housekeeper or Bob's son in law to go on. Just from LE. When the housekeeper was interviewed on Disappeared and said she arrived at 12noon, it was a surprise.
Police say son in law made more than one trip out of the home that day. There is only one receipt for 3.04pm though.
A journalist posted under one of his articles early on, that a detective told him they were regarding the 10am call to Bob as the last verifiable one. We don't know who it was from though.
ETA: All the comments under the article were eventually removed though.
I don't know what the IK timeline is. I'll have to look it up.
I think, because IK was such a high-profile case and there was such an extensive search for potential victims, LE would never have made their statements about Bob's disappearance being someone close, someone known, etc, if they thought there could be any link.
Do you know if IK usually took his victims with him if he attacked them in their homes?
Trouble is, even if we could whittle IK's timeline down to the exact time he could have been cruising through Placentia, it still wouldn't help. Nothing will, until the last known person to see Bob actually confirms what time that was.
Has 'Long Lost Love' been showing again, does anyone know?