Ok so I cut a guy s lawn and a company is putting rocks.in the yard how can I get them back I saw it

I'm not so sure that I fully understand your question, but if this "company" has a name what I would do is I would document this action the next time by taking pictures of the act. It also wouldn't be a bad idea to have someone with you as a witness.

Above and beyond this you could report them to the BBB (Better Business Bureau). You could even bring the police into the picture because these rocks when mowed over could easily turn into deadly projectiles and seriously harm, blind, or worst case kill someone.

I hope this helps, remember the most important thing that you can do is to have very "good" documentation, as mentioned earlier, someone with you to witness this act and pictures of someone in the act.

This is just my opinion of what may help you solve your problem, good luck.