engine purchase

Purchased an engine that's description claimed "tested" it also claimed to have low miles. Upon removal of the intake found a large rodent nest in the valley, there were massive amounts of oil and buildup on the exterior (fully aware of this being a thirty year old engine, but this was excessive), also not noted was a broken bolt on the exhaust manifold. Paid 500 for the engine plus freight of around 150. Called to see if we could exchange or return the engine since these things weren't noted. Was told that day since the description said "tested" (not sure how you test an engine with a 12 x 8 inch nest in it...) we would probably be charged the freight both ways plus a restocking fee. Waited over a week to hear from shop foreman and was told no different. Now have a $650 boat anchor. I read numerous negative reviews on this company and am adding my experience to aid others to not be scammed.