How did he make it there?

I was looking in my refugium and found what appears to be a snail. I have no idea how he made it in there. I have never placed a snail in there. His shell is very flat like if it's new and he's very small. I have never purchased a snail this size before. I haven't added any new rocks to my tank. All the rocks in the fug was from my past tank. All rocks were scrubbed off and inspected prior of placement. I have a picture of the snail. Any ideas on how he would have ended up there? It's a very long journey from my display to the fug.
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I have ended up with snails and fish in the sump. They take the ride down the overflow lines, some just get there faster than others.
 
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