I've been working at The Corporation now for ten years. My, how the time has flown.
At the five year mark, I received a hefty slab of glass with the anniversary etched inside. It's quite nice and quite hefty—enough that you woudn't want to be on the receiving end of it if thrown. For the ten year mark, I received the the 8″ Pinnacle Globe [1] from Glassical Designs [2]. It's not as heavy as the five year piece of glass, but it is much nicer in design.
Also included were gift cards worth $250, which is a very nice touch.
[1] https://glassicaldesigns.com/product/pinnacle-globe-jade/