Just be mentally prepared to handle factory seconds and all that is implied.
You may or may not have to sort them for various issues, or they may just have cosmetic issues that caused them to reject.
Many times, factory seconds are what comes at the “tails” of batch runs. That is product that doesn’t quite meet the requirements as the machinery is being dialed in, or if could be very slight cosmetic defect.
As long as you are aware and willing to accept a possible yield or performance problem, they can be functional and sometimes perform every bit as good as regular stuff. Once in a while, they can also be real dogs. YMMV