Is it your belief that when someone calls in a tip in a case that receives hundreds of tips into the hotline set up for that case their statement is taken by investigators during that initial call? Such that a caller's tip is investigated in real time, same day?
My understanding is that the caller's contact information is collected along with some basic notes about what the caller is reporting. Then the tips are assigned to investigators to follow up on by interviewing the tipster. It seems logical to me that tips may or may not be followed up on same day depending on the number of investigators available, the volume of tips received and how investigators then prioritize their tips for follow up?
I could be wrong I suppose, in assuming that the day a tipster is interviewed may not be the same day they actually reached out to LE.

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Police have followed up on tips from the public, saying
they have received more than 355 so far.
They also say
they have interviewed more than 50 people, and have more interviews planned in the coming days.
Few other details about the investigation have been released.
Missing N.S. children were seen day before disappearance: police published May 28th and describes the volume of tips and the number of interviews conducted at that point.