On the topic of tips and the number left remaining, quite likely they prioritize them looking for observations of any of these behaviours, as opposed to a tip, say of noticing a stranger somewhere who bears a resemblance to the blurry photo.
"The FBI is asking everyone to take a closer look at the people around you and report any major changes in behavior or appearance over the last several weeks, anything that seems strange, so they can check it out.
"If a person started abusing drugs, if a sleep pattern has changed - any indication like that taken on its own doesn't mean a thing, but when it's put into a broader context of timing and location, maybe," said FBI Special Agent in Charge Greg Massa.
The FBI is looking for anyone who:
Changed their appearance; cut their hair or drastically changed the way they dress
Started abusing drugs or alcohol when they wouldn't have beforehand
Has become anxious or irritable
Has followed this case and what the media is releasing with a sense that is "not normal"
Has a different sleep pattern now
Has been having ongoing conversations about where they were on Feb. 13
Traveled unexpectedly after Feb. 13
Canceled an appointment around Feb. 13
Called in sick to work or suddenly skipped a social engagement"
http://www.theindychannel.com/longform/delphi-the-investigation
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