Originally Posted by keesmom
Given their age and the time of year there is a strong possibility those red sex links are in a molt, and you would have yet more non-laying birds.
It would be hard to spot problems without experience of seeing said problems.....
....but good feathering, clear eyes/nostrils, clean feet/legs, plump combs/wattles.
Also do you have a plan for quarantine?
Birds can carry disease asymptomatically, stress of a new environment can cause disease to break and show.
Consider medical quarantine:
BYC Medical Quarantine Article
BYC 'medical quarantine' search
The stress of integrating new birds into your flock could put your existing one off laying and hamper the onset of lay in the other Wellies.
Moving stress in the new birds could hamper their laying too, if they are not already molting the change could throw them into a molt.
Adding more birds is often not the best solution to lack of eggs.
Sexlinks are high production birds and may lay thru molt and winter....but I wouldn't count on it.
The seller will probably tell you what you want to hear....it's a crap shoot.