Yes, I agree with Dan that if the client still has the same route with a reduction of several customers, then I'd say company bought back those several customers for the $30K. My answer would be different if this was not substantially the same route though.
I'd prorate the cost, amortization, and remaining basis saying that what was bought back was 30/130 or ~23.08% of the route and report that against the $30K proceeds so that the client would report ~ $21, 460 of gain (30K - 8540 of basis).
What I wouldn't do is frontload an entire $30K of basis against this sale and report -0- gain.