Someone stole my lamps

I had 6 of those little solar powered lamps along the footpath from my driveway to my front door, and this morning two of them are missing! Someone came up to my yard and just pulled them right out. Why on earth would anyone want to take just two lamps?

Unfortunately they all work sporadically at best, so probably the other 4 weren't on at the time. Now I'll have to either rearrange the existing 4 lamps or get some new ones. This is really pissing me off.