When looking to purchase something like a 85046a at auction, how concerned should I be about a unit's cosmetic condition, assuming it's being sold as-is?? How easy is it to damage the RF connectors, visibly or invisibly?? The test ports are part of $$$ integrated assemblies, right?? So not easily replaced.? Just wondering how much paranoia is justified, and whether outward signs of abuse or neglect (scuff marks, etc.) are a useful proxy for other, more serious damage.? Is this an item where a return policy or guarantee would be more worthwhile, versus other kinds of test equipment?