Perfect example of why you should look before you leap. You need to CONTINUE to look before leaping while working through this problem. DO NOT go replace all the links in the rear. LOOK first. All you have to do is examine all the dog bone joints looking for rubber pooching out of the joint. Any dog bone with rubber pooching needs replaced. Also check the subframe mounts that mount the suspension subassembly to the body of the car.

Assuming that the car received a good four wheel alignment, if you find a bad dog bone or two and replace them it will have near zero effect on your alignment.

Just so you know, any alignment tech worth minimum wage knows to inspect all components before alignment and release back to customer.