I have 10 Th/s for more than three months, all S1s , and never found any block.
You're God damn lucky!

I agree, he's lucky.
I've been mining 24x7 for 12 months and have never found a block. I've had a reasonable hash-rate too, currently at 5 TH/s.
He has not found a block mining solo.
He was mining on a pool and so essentially the pool found a block.