First check source of moisture. Is your eavestrough sealed properly, draining rain water at least 10 feet away from the foundation? If your landscape promotes water draining toward your foundation, change the angle so water runs away.
Second, never store paper or cardboard boxes directly on basement floor, nor where they cannot "breathe' to stay dry. Surefire way to promote mould growth and odors since paper products absorb moisture easily, from the floor or the air.
Run a large fan to create turbulence near one end of the room: place at about 45 degree angle to wall so that air bounces from one wall to other basement areas, while leaving a basement window in other end of the room open an inch or two for fresh air feed to the fan. Secure the window so it cannot be slid open from outside.
Remove any damp items, carpeting, etc, and dry thoroughly or replace with something that does not retain moisture, if anything. Depending on your climate, the concrete floor could be adequate on it's own.
Ensure your dryer is venting completely to the outside, with NO leaks of the hot damp dryer air into the basement. Big no-no.
Avoid use of masking agents such as air spray, since it will mask the real problem, and are not good to breathe anyway. If the odour persists, check everything again to see where moisture/water is entering the basement. That's your main concern. Keep everything high and dry.