(NewsNation) — The family of missing Texas A&M student Caleb Harris tells “Morning in America” they’re urging the public to check security cameras as they remain hopeful for his safe return as the search enters its fourth week.

“Everybody that has security cameras in and around Corpus Christi and other areas, just take five minutes, go back to that 2:30 to 3:30 or 2:30 to 4 o’clock timeframe, and look at your cameras. See if we can find anything because, in today’s technology, there’s got to be a video out there somewhere,” said Caleb’s father Randy Harris.

Caleb was last seen in the early hours of March 4. He had walked his dog before 3 a.m., which his father said wasn’t unusual for him. The second-year student returned home with the dog and ordered Uber Eats at 2:45 a.m.

He has not been seen since, and the order was found still sitting on the doorstep by Caleb Harris’ two roommates later that morning. Randy Harris said his son’s phone has been dead ever since.

A $25,000 reward is being offered for any information into Caleb’s disappearance; however, the information must be provided by March 31.

Randy said a friend donated a helicopter and he plans to conduct aerial searches Monday, particularly in areas crews haven’t been able to access via four-by-fours, ATVs, and boats.

“Not a whole lot of direction just yet. We’re still trying to find true north and we’re just hoping today we’ll get some some breaks,” he said. “We’re chasing every single lead that comes in. Of course, we were offering the reward now. So that’s hopefully beginning to bring in some leads that we can at least go look for. That’s what we’re hoping.”

Randy previously told NewsNation’s Chris Cuomo that his son has no medical conditions or mental health issues that might have contributed to his disappearance, and he doesn’t have a habit of leaving without letting people know where he was going. Harris described his son as a normal 21-year-old man who loves to fish and hunt.

Randy said there’s much about Caleb’s disappearance that doesn’t fit with his personality.

“He was a very scheduled individual. He was texting me photos of fishing lures earlier in the evening of what he was planning on using the next day,” said Randy. “Everything was looking good, He had good grades. There’s no indication of anything. He left his wallet and his keys. We’re 100% sure he was barefooted, even.”

Caleb Harris has brown hair and eyes, stands 5’11” and weighs around 180 pounds. Anyone with information is urged to call the Corpus Christi Police Department at 361-886-2840 or 361-886-2600.

NewsNation’s Stephanie Whiteside and Sean Noone contributed to this report.