i got a frame the other day from a garage sale and the guy said he took it straight from the specialized dumpster where they dispose of frames. the frame's toptube was cut and the guy welded it back together. the paint was all stripped and it's just bare aluminum. i was wondering if the frame is ok for riding or are there other reasons why a factory/company would chop a frame to discourage people from stealing it out from the dumpster? thanks