Typical of an axle that the lubricant has dried out or departed as well.

Remove clamp from the small end of boot and use a turkey baster or something with a small diameter hose. Squirt in some heavy grade oil install a clamp again and you will probably be good to go. Also do the other side of the car as well.

The only thing perhaps a little unusual in your case is that the clicking seems in general to become noticeable After the joint has seen some highway miles. The earlier you get some oil in there now before driving much more the better chance the joint will survive.

When I see people asking what maintenance should be done on a new acquisition I have thought about mentioning this if the boots are still good. These original joints in my opinion are very tough and will probably last the life of the car if the oil that was the original used as a lubricant is topped up a little. The problem with using grease is that it gets displaced from the pressure areas and remains that way as the lubricant bleeds out of the soap base and it hardens. You cannot keep oil out of the pressure point areas.

Most of the cheap replacement axles are Chinese. With my experience with their aftermarket bearing type devices being as it has been I avoid them. If I landed up with a totally failed joint I would rather scavenge a pair from the wreckers with good boots. Clean them out and add new oil or just add oil. Then install them on the opposite sides of my car from what they where removed from. Or in your case if a replacement became needed just one axle from the opposite side of a junker. .

Few if any of these cars have landed up in an auto wreckers because of a bad cv joint.