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If I understand your question right They are $430 for a new set.
And these are in very good condition.
How old are they and about how many hours do you think are on them.
They are a few years old. However, I treat all my gear like an Intel chip in my hands. If you look closely at the picture you can even see that I even kept the little pack of beads that suck oxygen (they do somthing like that), as well as all the plastic baggies. I never used the windscreens or the adapter screws.
And where did you use them.
Environment: My home based studio which I clean and dust periodically. Not to say these things are fragile...they are built like a rock. I'm just annal like that. I even keep my 57, and 58 in it's original bag and box when not in use.
Application: mainly overheads and acoustic. Once for vocals just for some scratch stuff (even then they were not bad, But I'm not in the habit of using these for vocals). I've heard great stuff about these and piano.
I would assume anything in the high register would be good. The low end will surprise you on these mics. I once used them as the only drum mics on the kit and got some really nice results.
This is not my video, but a good one showing the two mic drum thing:
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