This is what i would do.......
At 4:44PM I'd have a friend drive me to the library and have him wait for me in front of the library with a cell phone by his side. I'd go inside the library by myself with a cell phone in my pants with his number dialed so that if anything happens i just have to press the talk button.
Once inside the library i'd look around a bit and see if anyone is watching over me suspiciously or too much. If i could'nt find any clues once inside i'd go up to the library person and show them the envelopes and ask if he/she knows anything about them. If she can't help me i'd ask for the head librarian and ask them same, if she doens't know i'd explain the situation and see what comes out of that.
If no one knows anything i'd go to the bathroom to call my friend, i'd tell him to leave his car keys inside the glove compartment with the doors unlocked and to come inside and to try to be unnoticible as possible and too look around the entrance of the bathroom and to tell me if the coast is clear to come out. If he tells me coast is clear i'd walk outside towards the parking lot to leave while my friend looks after me with his cell dialed at 911. If he tells me theres someone waiting suspiciously around the area then i'd make him call the police and then go up to that person and ask them about a book while i get out the bathroom. Once i come out i'd take a good look of the person (name tag) (face) etc.. and walk away towards the car while my friend keeps talking to him/her. Then i'd walk up to my friends car and drive to my house to pick up my car. I'd call my friend and tell him to keep his eye on the "attacker" as I drive back to the library.
Once i return i'd just wait and till the attacker leaves to record his license plate number and i'd try to follow him to his house and get his adress or anything else i can. If it gets to this point then my friend can take a bus to my house.
If i get his info i'd go pick up my friend call the cops and go to his house to solve this.
This could turn into a million diff things but i'd have my cell, and my friend with his cell behind me. They would'nt know hes with me so thats a big plus for me. But its a risk i'd be willling to take.
Maybe the doc will do the same
