I walked 18 today around lunch. The front 9 was empty, which was nice. However, on the back 9 I caught up to a backlog of duos in carts. When the duo in front of me would tee off, I would wait until they hit their second shot and moved and then I would tee off, so I never hit within 50 yards of them.
On the 18th hole, I watched them tee off and it looked like they hit it well. I take my time getting up to the tee box. Take a drink of water, and then go up to the tee box and tee my ball up. I crouch down and can't see the guys or their cart, so I assume they are on the other side of the tree line and closer to the green. I tee off and as the ball is in the air I see their cart driving back to near where my ball is about to land (and proceeds to land). Then I watch both guys get out of their cart, one hits a ball that is suspiciously close to where I watched mine land (saw it land and bounce twice). Then the other guy drops a ball and hit it as well.
I walk up close enough to yell sorry as they are driving off and one guy just raises his hand. I get there, can't find my ball. I walked around the entire time they finished their round and could not find it. I watched it land just on the left side of the cart path and the rough isn't very tall in that area. I could not find the ball. I'm guessing the first guy hit my ball or pocketed it. Extremely frustrating.