Those old photographs you have may not just be of family members and friends. The individuals pictured could have been co-workers as well.
The 1970s picture in the illustration was (to me) clearly my Mom and her fellow teachers. Sometimes the determination is not so easy. What’s worth remembering is that not everyone you have a picture of is a relative. Co-workers and classmates may easily appear in pictures you have. And occasionally the random person.
But if you discover work-related photos, considering sharing them. Someone else may be glad you did.