Alright I just recieved my spore syringe from spores101.com and the syringe looks like someone just filled it with water, I dont even see anything in 'em.
Well, spores are microscopic, but in every syringe I ever bought (6) you could see dark little clumps in it. It didn't look like much but you could definetly see something floating in the water. If you have any access to a microscope you could shake up the syringe and put a single drop on a slide and you should be able to see spores if there is any in the water.