So not to be too identifying I'll change the details a little
I work for a company that sells luxury £££ products. Talking £90,000 cars/watches type thing, nothing is cheap!
I stock up the staff and customer toilets with sanitary products, usually supermarket own brand. I'm the only one with access to customer toilets so no other staff go in
Filled up with two full packs of pads, and a box of tampons (taken out the boxes and put into bags). Checked the next day, bags still there, all pads/tampons gone
I mean... why?!? It's a 50p pack of pads 
And it happens every time they get filled so it's not just one customer