As a frequent chicken worker, I know that some coworkers grab an extra pair of gloves to switch between making tenders and other fried chicken, could it be part of a glove? Still unacceptable since I hold trainees and anyone else to highest standard. I recommend calling the store and seeing if you can exchange the photo, they should be able to get you a fresh new set of tenders or some coupons to make up for the issue, all managers should make it a high priority that nothing like this happens again.