Can employers take and copy personal documents?

[Tynee]

My sister's employer posted that the employees had until Sunday to clean out their lockers so he could reorganize them. On the Friday prior to the stated deadline of Sunday the manager moved her locker contents to another locker to make room for storing inventory in her current locker. The manager did not notify her he was moving her locker contents earlier than posted. The manager did not inform her after the move either. When she came back to her locker her items were gone. She asked her manager if he knew where her belongings were. He then told her of the moving event. Upon her inspection she identified that two pages of notes were removed from a notebook that was in her locker. She asked the manager if he took her documents and why. He replied that he was going to make copies of them because he wanted to read them. As his actions of not communicating he was moving her items and not communicating he took the two pages for his reading it seems as though he was doing this all with no intention of informing her he took the pages from her note pad. Isn't taking something without asking stealing? She had to ask for he pages back. He didn't even offer to return them when she asked about them. The question is, is this legal to take her personal documents to make copies so he can later read them? Isn't this stealing or at the least invasion of privacy. I understand the locker is subject to search; however this was not a declared search. The manager was simply reorganizing the lockers for storage. Additionally, if her purse was in the locker does this indicate that he could dig in her purse to obtain documents for his review as well? Where is the line for invasion of privacy? Can an employer go through coat pockets of the jackets that are on the company premises because the jackets are hanging on the company's coat racks, just as her belongings were in the locker?