I'm not familiar with anything else of his. I don't know if releases were signed or if parents were present or gave permission or not.
I'm sure girls under 18 would have gotten in trouble for sending him photos, especially if unsolicited. If they did he must have brought it to the attention of authorities or somehow they became aware that girls sent nude photos.
But anyway, what does this have to do with you looking for a lab to develop your NSFW photos? If his are explicit or pornographic then it seems like his problem if he gets in trouble for taking inappropriate photos of underage girls. Maybe you're checking IDs and he may not be, or wasn't back in the day, I don't know.