OP, I think you are at the end of the spectrum, from the other side I have seen office supplies & bathroom supplies have to eventually be kept locked up.
Place A: caught one of the vending machine suppliers stealing a can of coffee, suspected this was not the first time;
Place B: Caught an employee stealing both toilet paper and paper towels. Her rationale was that she wasn't paid enough to afford these things and immediately asked for a raise. Also caught an employee stealing hand cleaner - she was bringing in a cold cream jar and filling it from the economy size. Someone caught an employee filling their liquid soap from home by taking a little out of each of the bathroom bottles. Unbelievable.
Place C: caught an employee photocopying a text book after hours one evening. Also caught an employee taking home rolls of toilet paper. I've seen an employee reach into the supply cabinet and take a box of red pens, blue pens & black pens. The next day when I asked for a red pen she said she was out...
I worked at a landscaping company (we were given a significant discount on purchases - with manual purchase tickets) and after hours saw an employee loading up bags of fertilizer into their personal car, I've seen employees toss a flat of plants in their trunks and drive off without a purchase ticket ever crossing my desk. One time I went to a housewarming party at an employee's home and the new landscaping was beautiful, the crates, bags and plant cups (branded with my employer's logo) were still in the backyard to be disposed of. Never saw a ticket on any of that either - my boss asked me about that one but only chastised the employee, no payment was required from them (and then the thefts really started to pick up
Same landscaping business has gotten calls from customers complaining about landscaping jobs that were never on the books - apparently an employee was offering a great discount for cash payments.
I have to wonder if this office manager is on a power trip, has had to deal with similar issues and is now a hoarder or she is one of the above, taking them home instead of distributing them?